I love how there are so many people who don't respect their healers enough to wait for the healers to do their job and buff the party, but insist that, "Well, if you can't keep up, you shouldn't play as a healer!" Wow. Just wow. Wait, nevermind. This is the forums. These types of responses are to be expected. People claiming that it's inconsiderate for the healer to expect the tank/party to wait for buffs due to someone's "time constraints" as if waiting for an extra 30 seconds is going to really cut in to the amount of time that someone has to play the game.

If you can't spare an extra 30 seconds - 1 min to be courteous to your healer due to "time constraints", I would suggest participating in solo content since apparently being a "team player" isn't on your short list of things to do.

Not trying to be a d*ck, but come on people. Has common courtesy been lost on this generation???

With all of that said, I don't see a problem with a healer simply casting buffs when everyone is working on taking out the first group of trash mobs. There's little chance that, in the time it takes to cast buffs, that the tank is going to be KO'd, and after applying buffs, topping off the tanks hp would be less of an enmity concern and seemingly more appropriate anyway.