When I know absolutely I'll pull off a tank (aka right before a boss where I've popped all my CDs, Empyreal Arrow + Barrage will immediately put all aggro on me..oops), I'll pop Quelling strikes beforehand. Sometimes that doesn't even work though (even while waiting for the tank to pull first).
Since it only STOPS emnity and doesn't decrease it at all...well. If I've taken your aggro sure I'll use it but then it's up to you to get it back, since there's not much else I can do besides stop attacking completely (which I have done in certain cases).

But yeah people who refuse to use it are just lazy