Sure it can still be used sometimes, but when it was ans instant "MoT" it could be used more often for just the cost of a GCD. If they wanted to limit its use they should have done it with a longer cooldown rather than making it channeled. I guess my big issue with it is that due to the fact that you so rarely can use it you often don't remember to use it when it is available.
Having said that a Holy priest may need it more and therefore be more aware of it.