I recently had the misfortune of healing a druid tank who did not seem aware of the array of cooldowns available to the class. This first became apparent when he died. No, actually, it was probably apparent before that ... maybe when he was taking an absurd amount of damage at the start of every trash pull. Possibly when every boss ability was cause for quiet panic. Maybe when the combat log showed absolutely no cooldown use of any kind. I don't know. There were several signs along the way.
Not acceptable, druids.
Proper use of cooldowns is the difference between a player who goes home from a bar alone in the evenings and one who has to install a deli ticket counter outside his bedroom and periodically step outside, yelling, "Next!"*
*Note: Statement is not actually true.