the Awesome Highlighter

You don't generally bring more healers because the healers you have are OOM. You generally bring more healers because the healing per second you need to achieve can't be managed by the number of healers you have.   remove

In Ulduar, you should run out of mana if...1) You don't have enough gear for the instance.2) You aren't playing the encounter well enough.If you have good enough gear and good enough skill and aren't standing in fires and are kiting adds correctly and doing all the right things, then you aren't designed to run OOM.   remove

having infinite mana was allowing too much of a buffer on those two factors   remove

Naxx was designed to be easy, and Ulduar isn't going to be a lot harder. Hard modes on the bosses though are designed to be very hard. That means being inefficient with mana has to be a liability   remove

There are plenty of healers who thought Naxx was way too easy and are eager for more of a challenge. They will find it in Ulduar, at least in the hard modes. They will find the deck stacked against them.   remove

Naxx = play bad and win. Ulduar = play good and win.   remove

Yes the responsibility of healing the raid is yours. The responsibility of doing things that let you do your job is that of the dps and the tanks.   remove

Lich King’s first tier of raiding and all the heroic content is much easier than it was in Burning Crusade in order to make it more approachable for players not interested in hardcore raiding.   remove