I was in a group about a week or more ago, knocking out group quests in Dragonblight, when just before a fight I dispersed to gain some mana instead of sitting and drinking. The kid next to me promptly says,"What are you doing? Do you know that has a 3 minute cool down?" To me, it was just a quick fill up to help speed things along. To him, it was a really big thing.
How many times do you stop before using an ability and think,"Hey, maybe I should wait and use that on something else?" I do sometimes, usually while in instance groups or raids. But its not as frequent as it used to be. If I were always saving the cooldown on my shadow fiend for just the right time, I would hardly ever use him. I like my shadow fiend. He's purple and he has the same aura as I do, and he is pretty tough. I let him tank a couple of group quest bosses while I was soloing today. If I could name him, his name would be George. I like to see him more often than the random boss fight. I also like to change into a big pouffy cloud of purple mana and shadow more often than when it is absolutely needed. And those nifty angel wings I can give to enhance healing that keep me from being labeled the worst healer ever? I use them as often as possible when grouped. I'm glyphed so that, if it doesn't save my butt from the horrible healer tag, I get to use it again in a minute. Too cool for words. That, and the angel wings are so neat!
Moral of the story? Loosen up! Run around while questing and use that nifty spell whenever it tickles your fancy. Whip out your Fire Elemental to take out a critter if you want. Make those cooldown savers have a mini heart attack. When you've finished demonstrating your prowess, waste another cooldown. You'll be glad you did. Just make sure your resurrect spell is off cooldown. That poor mage just keeled over because of your silly wastefulness of cooldowns!