Jumped on to do a quick random for my two frosts last night after work. What transpired ended up being somewhat amusing so I thought I'd recount some of it.
I queued up for my random as my usual healer self and got dumped into Halls of Stone. Only, it wasn't at the entrance. We were right at the entrance to Krystallus. Several were finishing their run back to the spot, they were in a post-wipe phase and had somehow lost their healer. After appropriate buffs were passed around and before running in, I said "ok, please remember to stay away from each other after his blowback." On the very first blowback, the mage near me got thrown further away (my back was to a nearby wall) and ran right past me as we turned to stone. Boom, I'm dead, great. I thanked him for my 6 gold repair bill and released to run back. I got back just as the DK tank had finished kiting Krystallus back out of his room. All the DPS had died in the process. A few touchup heals and Krystallus fell over dead. Before I could rez anyone, all three DPS released and left the instance. I guess from their point of view they'd taken two wipes and were calling it quits.
I let the tank know I'd stick it out (hah, a tree pun) and we re-queued. As you'd imagine we had three fresh new DPS in short order and off we went. Maiden of Grief was easy as always. Duh, don't stand in black stuff. Just as Brann started his thing in the Tribunal of Ages the tank says he's gotta go. He'd stay around till this sequence with Brann was finished, but his guild was starting ICC and he had to head out quick. Tank gone. We cleared the one last group of roving mobs that's always left over outside the last boss and right on the spot a new tank showed up. He was ecstatic that we only had the last boss to go. Two minutes later we had opened the door, charged in, and downed the boss. The usual thanks for group got passed around, and it hit me. No one that finished this instance were present when it had started. I've never before been a part of a complete group swap-out.
On a side note. VuhDo rocks. I'm now one week into using it for all of my healing needs. Next week I'll get some screenshots ready and start working on a quick demo of how I've got mine set up.