How do I heal better as a white mage?

[Salem_Rain]

Are there any reasons for Tanks to use AOEs? I have often heard this excuse used by a tank in Brayflox for waking up sleep adds, demanding that we not sleep "too slow", etc. As I don't play a tank, I don't know how they work (as far as whether any of the tank classes are AOE hate driven, etc.) I just wanted to know if this was legit or complete bs on the tank's part, because not CCing on a pull makes things much more difficult for the healer from Brayflox onward.

[Heals]

I think so, on the use of tank aoe. For getting aggro, or re-getting aggro if one or more mobs starts charging at the healer from overheals or something. I've seen tanks put mobs to sleep themselves, until the evil thaum tried an aoe and woke them up and the tank had to grab aggro so they didnt eat the mage. A quick aoe can save people, but I normally have a tank who marks the mobs in kill order so the dps know what to kill first etc.,or what number needs to be sleeped. Sometimes trash mobs are fine to aoe.
If a tank isnt communicating, marking mobs..losing alot of health when he/she shouldn't be, not holding aggro (and the aggro loss not being from overheals or power hungry dps)...they're prolly new, or just bad tanks. I have seen so much bad in groups over my years of healing. You chalk it up as experience, learn from it and sometimes leave the dungeon because it just isnt gonna happen.

[Karleguarth]

Are there any reasons for Tanks to use AOEs?

Yes there is,
as a Warrior tank, even if Flash is added to skill list, the times they can activate it is very limited due to low MP pool
Overpower, their enmity generating AoE, usually for a few times at the start of each fights is essential to keep slept mobs from chasing the healer after enmity generated by heals during they're sleeping.

So for best result, learn / ask how many Overpower they're going to use, apply sleep afterwards.
But if the Warrior simply wake them up in the middle of a fight with Overpower... their fault.