I know this thread was necroed, but I'll add my two cents from the Pally-learning-a-Priest perspective. I have never had a problem in any raid with a Holy Priest healing the MT or OT. I have never been assigned raid healing as a Pally, and if I'm the only raid healer there's going to be people dying because I can only single-target raid heal with no AoE heal.
In my opinion, the OP's raid leader, or whoever was doing the heal assignments, probably doesn't know the different healing classes. On Naxx-10 with only a Priest and a Pally the Pally should be healing the MT. And on Patchwerk, its O.K. to put the Priest on the MT, but putting the Pally on raid? There's no raid damage, and who was healing the OT soaking the Hatefuls? Something is missing, maybe there was a third healer.
As for Pallies being given the raid healing duties because in a sustained fight they cant keep up the Holy Light spam, I have just over 25k mana, raid-buffed. I can spam Holy Light for the entire boss fight. Last night in an Ulduar-10 run 61% of my heals were Holy Light, and that's misleading because WWS shows 11% were beacon heals. Looking at only casted heals its closer to 80%. Maybe you need to stack more Int.
In any event, the reason I leveled my Priest is because you guys are sooo versatile. With my Pally I am pigeon-holed, and with good reason. But if I had to choose the second healing class with me in any 10-man in the game? Hands down a Priesty.
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We didn't wipe much when he was healing MT, though he only stayed for 2 bosses, Thaddius and Razuvious
You didn't wipe because Thadd and Raz don't require a lot of MT heals. With Raz you need to heal the Understudies that are MC'd while the MT tanks the other two, who don't do much damage at all. And on Thadd the tank just doesn't take much damage and a Shammy can easily heal one of the two platform mini-boss tanks. If he had stuck around for Sapph I'll bet he wouldn't have been able to keep the tank up alone.
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