The way the Brotherhood of Oblivion has been running Ulduar, each of our three healers fills three distinct roles.
Raid Healer (“Raid Bitch” as I oh so fondly call them)
BoO typically runs with a holy paladin, a disc priest, and any given tree/shaman/holy priest, if you’re curious.
A paladin fills the role of tank healer nicely. Whoever you have in this position, however, their job is to heal the main tank and ONLY the main tank. Ulduar is not Naxx-several Ulduar bosses tend to be right mean bastards, and you can NOT take your heals off the tank. Never ever.
A raid healer is just that: a raid healer. You…heal the raid. You also occasionally toss some stuff the tanks way, if a fellow healer is in the vibrating crotch pot/being chased by eye beams/what have you.
Last and certainly not least is the support healer. This person is all over the damn place. Our disc priests tend to fill this role, but anyone who can be a bit of everything is good. Throw supporting heals on the MT (bubbles and hots are great). Heal the OT. When your MT healer is temporarily not able to heal due to Some Stupid Mechanic, you take over his job. When someone is in the love pocket/fist of doom, you heal them. This requires someone with a high level of awareness as well as flexibility. No, I don’t know why they have me do this job, either.
Communication is important! For Kologarn, I have our MT healer call out when he’s being chased by eye beams. For when people are being stupid on vent and refusing to shut up, I also mark him with a condom or something silly so that I can see him running in circles on the side of my screen.
And that is Amber’s Random Thoughts On Ulduar Healing for today.