I've become quite spoiled (as a healing priest) with the way mana has regenerated since the release of BC. Back in "the day" (it was, indeed, a Wednesday) in 40-man raids, we used to have healing rotations set fom MC, AQ40, and BWL. We KNEW that the main bank of healers would go OOM on a boss fight, and they would rotate out at 25% with the next batch subbing in. Of course, this kind of thing could never work now because of healing meters, dps meters, etc. Back on that Wednesday, we raided to win the battle...there was strategy, teamwork, and no chest-thumping or finger-pointing. Now everyone fights for top of the meter and figures that will get the job done. Sounds alot like a Wall-Street brokerage house to me. To be fair, though, alot of guild leaders and raid leaders use those same meters to determine who is pulling their weight.
I think this will be a great thing for 10 and 25-man raids going forward...but I worry a bit about how it will dramatically slow down heroics while the casters sit and drink after every pull (where there is generally only 1 healer). Can we do something in 5-man content to keep mana regen higher? Maybe more mobs dropping a bit of "loose mana?" Or maybe some powerful instance-specific pots that could drop (like we used to have in TK?)