So I've got my NIN(Main) WHM(played since beta) and started playing some DRK that I got all of them to 70, so I have a general understanding of all the roles, I've noticed when I play healer in the dungeons the Tanks are absolutely getting wrecked, I feel like they are barely using any cooldowns is this a standard for normal dungeons?

When I tank just want to make sure I can make the healers job easier? What if any cooldowns do you guys normally use on mobs when your pulling the 61-70 dungeons?