The only thing I can think of would be to allow usage of tremor while feared/slept/charmed but give it like a 30 sec cd. or something. That way shamans don't have to keep spamming it while their opponent keeps spamming their macro. Playing the "totem mini-game" with hunters and warlocks gets pretty tiring.
This is what could be a decent band-aid fix. Current tremor is beyond silly. Just imagine if wotf was 30 seconds instead of 2 minutes, and also acted as a dispel to you whole team as well. Now just think for a moment the current state of tremor.
Of course this is from a warlock PoV with no CD fear, maybe the above idea won't be as popular to priests since they got CD on their fear.