Don't worry. Given the chance I'll help deflate his ego in the near future
You have some very valid concerns, and I also agree that great damage isn't really that essential for progression. I am completely okay with doing odd jobs, such as HM Will/Elegon soaking or Garalon kiting. I was on add duty for Protectors, and while my dots tended to be overkill on them and cost me some damage, it helped us get the kill, so I didn't have a single complaint. Getting bosses down is the most important thing, as I do see myself as part of a greater whole in raids. While I love fights that allow me to purely maximize my DPS, not every fight is like that. I can eat my veggies!
Here is some utility that I've found for Shadow:
Dispersion has been put to great use this tier and last tier. I soaked for HM Elegon and Will, taking very little damage and allowing healers to focus on others. I could also solo soak Unseen Strikes on Blade Lord, probably annoying Disc priests that have already blanketed the raid in shells but I think helping out overall Currently, I solo soak Static Shocks with it. On a similar note to dispersion, I found that I could negate Korthik Strikes on Wind Lord to take no damage by taking Phantasm (before it was nerfed for PvP reasons) and popping Fade as soon as I was targetted. I had such high hopes for Spectral Guise, but it's been a let down in raids so far.
Mass dispel has also been of great value to raids. I felt very instrumental during Wind Lord progression because of how important the dispels were, and while it required me to VT for mana more than I would have normally, I was happy to lower my DPS if it means a kill. More recently, I've used mass dispel on Heroic Horridon at the first gate to frequently cleanse melee of the sunfire debuff. Again, this requires VTing adds for mana more than is really optimal for DPS, but I'm okay with that. Let's see. Mass dispel was great for Spirit Kings and for Tsulong's Terrorize, too!
Vampiric Embrace is a cooldown that I try to use well. My "go to" glyph setup for raid fights includes the VE glyph. This makes it more potent, since I can pop it along with DP (and MF:I on many fights this tier) to get a much bigger burst of healing as well as larger overall amount of healing done. I try to time this for heavy raid damage when possible, and especially during progression try to use it several times a fight. At the very least, I'll use it at one time it's needed most, where I can make sure I have 3 orbs ready to go for it. We had a bit of trouble keeping up with healing at the 3rd gate of Horridon, so I'd use it there and then on phase 2. The same goes for Iron Qon. I typically use it after exiting Windstorm and also in phase 2. On farm content, healers seem to want me to stop nibbling on their slices of the healing pie, though.
Void Shift is very underrated by many priests that I've seen. I can't say I get raid-saving shifts in on every fight, but am conscious of it and try to be pretty "handy" with my ghetto lay on hands.
I've used Life Grip recently to save a few people that seem to have major issues with their computer during Lei Shen. It's no good to DC or freeze up when Thunderstruck is going out right next to them, but a quick grip buys them some time to log back in. It's hardly game changing, but I even remember way back during Bastion of Twilight's trash on the way to Valiona, those adds that blow up and knock people down into the abyss. I was able to catch a few tanks there!
Fear Ward was a nice back up on Tsulong, just in case a healer got feared. I also tended to use it on Vizier to at least slightly mitigate fears during convert.
Class Flexibility is what drew me to switch to this class to begin with. I've played every healer class in a raiding environment except a monk (who is 90 but hasn't been played in months), and priest healing is my favorite. I did HM Shek'zeer in 10-man, and we needed to 4 heal it. I was happy to go Disc for the fight, which seemed to help get us the kill!
As for my current guild, the stability is very much opposite of South of Heaven. It was supposed to be a 9 hour raid week, but I don't think it's been less than 18 for the past 2 months. It's frustrating to log on shortly before raid time and find that they've already killed a boss or two because enough people were on to start an hour early, so they did. It's even more frustrating when the GM/RL adds extra raid days on a whim week by week or extends the raid an hour late for no real reason. I'm actually totally in favor of staying a bit late if we're wiping at 5% or something, but "let's just get one more boss down tonight. I get to sleep in tomorrow" when all that's left is farm cleanup and we have another raid night left in the week isn't a good reason for me. There are some other issues as you may suspect from such erratic leadership, but I think that demonstrates the overall atmosphere that I'm not enjoying.
I always thought that Geeks were more awkward and weird, while nerds were more intensely focused on.. nerdy things, like reading text books or taking screenshots of ranks. How do you distinguish the two? Maybe I'm neither and a dork instead?!
Thank you for your responses!