Tempest Keep is a completely different beast, those adds dispell flame shock as it already, so unless they're all stunned or you had the reflexes of a cat, they'd dispell it before the GCD came off anyway.
I get what you mean though, each to their own, I just feel CL is a bit clunky with it(And I'm a melee, not a caster, personal thing, but it seems really awkward having to be a caster in old content), although it has no CD in WoD for Enhance? Swore I just read that in this thread, seem to have gone blind in the last few minutes, maybe it will be better then.