It helps a lot even now but it isn't required. The "ideal" group isn't 1 tank, 3 mages, and a healer. CC is important in Ulduar ... some of the trash will make quick work of you. Outside of Ulduar people will really complain about doing it.
I know a mage friend who HATES to sheep. If you ask her to sheep she'll go nuts and just not do it. Needless to say she really hates it that in Ulduar she *has* to sheep to the point of the raid waiting on her to run errands or whatever since she is the only mage. Kinda funny how when she plays her healer she bitches when people don't use max-cc because, and I quote, "I have to work harder at healing" ....
Former healbot now a Disgruntled protection warrior.
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