As you progress through the zones, your health and damage will increase.

I found, going from 84th to 85th is a large health increase without the gear improving that much.
As in going from say 75k to 90k health, on the level up.
But everything previous, was pretty much health/damage as a result of better gear and rather gradual.

There are quite a few bunny like quests.
Maybe a dozen or so, throughout Cataclysm.
Make a macro, /Target Whatever.
Click that, then do IWT.
Makes those quests simple, instead of annoying.