Well I'm really disappointed in blizz doing this. Putting our 1 aoe threat builder on a 15 second cooldown is pretty dumb. They should've just nerfed some of the damage it does, or given it a lower cd. Hammer of the Righteous has a 3 second cooldown and hits all targets, and also gives a charge of holy power.
I hope blizz doesn't make this change permanent for monks, or else running dungeons is going to be annoying.