DPS queue issue? There's no issue aside from the fact that EVERYBODY wants to deal damage and not tank or heal. Tanking is somewhat boring (just picked up PLD recently and am learning this) and healing has too many responsibilities. All DPS have to do is dodge and deal big numbers, pretty much no responsibility falls on the DPS until DPS checks and certain mechanics like pressing a button mid fight.

Hell I even ditched healing (mained WHM since the very beginning) for playing SMN. WHM in T5 was stressing me out and I was losing interest for the class. I find SMN so much more enjoyable then WHM and it's keeping my interest in the game from dying out