I don't know if I'm the only one who has noticed this, but the difference for me between Holy and Disc mana regen is huge. Not the numbers, no, but the actual, in battle, amount of mana I have after five minutes is greatly different.
Doing Iron Council, for instance. Two minutes into the fight as holy, I find myself throwing out my shadowfiend, another two minutes throwing out a Hymn of Hope, and about another two minutes later popping a potion, thirty seconds later, I'm still oom, and while replenishment continues to tick, I can't keep up with the mana lost.
However, same fight, but as disc, I can go the entire fight without popping a single cooldown [Power Infusion goes to a caster dps in this case, not on myself], and still have over twenty-five percent of my mana pool left by the time the last guy goes down.
I know that I'm doing two different roles between holy and disc, one being a raid healer, and one being a tank healer, but even when I'm disc I don't entirely concentrate on the tank [gotta pick up a bit of the slack when I can, y'know?] and I'm throwing out heals to anyone I find getting low, or not topped off when the tank isn't in danger of dying.
Anyone else noticed this? Or is it just me?