ExploderWizard
Hero
As for PCs not having it, the problem there is that what prevents them from using it on the BBEG Solo? Using it on a regular monster is fine, or even an elite, but when you're down to that Solo encounter, a few bad saves on the side of the GM might turn that encounter anti-climatic.
This is the problem. Beating down powers and abilities with a nerf stick until its not worth having them anymore. When the design prevents the use of varied and interesting abilities (and not just the ones that deal damage and perhaps add a status effect that gets shrugged off in a round) purely on the basis that it just MIGHT ( oh noes) get used in a major conflict that would really matter to the PC's and give them a sense of accomplishment then there is a problem.
Giving PC's balloon monsters to pop as a consolation prize doesn't quite cut it.