I'm personally not a big fan of this change but not because of its going to hurt me. What I mean by that is that I run DK/Pal and in 2300+ atm and I'm not really worried at our level that a warrior with 1.5 sec cast time is going to get it off. If I allow a fucking warrior to cast this then I really shouldn't be that high anyways.
That being said, warriors need buffs but this is the wrong way to go about it. Typically giving a class a counter-class ability (see lifebloom vs deathknight's plague strike) has never ended well and usually ends up being complete bitch and qqfest until it is removed or changed. They should've gave warriors a buff elsewhere, instead of this.
Eitherway, good players will learn to adapt, and bad players will continue to say lol wow pvp.