The new Crushs are a direct result of us clamoring about the huge disparity between tanks going from white con to yellow con, and how paladin tanking takes a complete 180 with arbitrary stun caps. A small DPS gain is light years better than Stuns that don't stun. I'd have preferred a level 88 stun cap, but they made it perfectly clear thats not going happen. Could there have been a better solution other than Crushs? Sure. But this kills 2 birds with 1 stone IMO.....gives us agro spells that aren't double cast-time cheap knockoffs of Terrors on stun-immune mobs, plus gives a DPS increase.
The way I see it, is Crushs give us large flexibility on an array of different level content. CoC is pretty much a given to be used in all content. The only real decision is when to swap out CofCS and FotCS, which boils down to A) whether or not the content you are in is stunnable or stun-immune, or B) whether or not a chanter/bard is in the group.
Of course you don't want to be popping off a Crush around damage sensitive mobs, but at the same time its fairly easy to predict what type of environment you'll be playing in to determine which spell set is required for both groups and raids. Even if you've loaded the "wrong" spell set, we still have Force of Disruption, Devout Force, and/or Charge for Honor to fall back on for agroing damage sensitive mobs.
Lots of options here, and thats a good thing!
You are correct in that Crushs are not practicle for DPS when not tanking, but then again providing the "other" tank with stun mitigation isn't practicle either....especially in stun-immune content

The reverse DS, on the other hand, is very nice for all situations (other than kiting and stun locking).
And no, Crushs will not trigger the AA group heal proc. But I will certainly ask!