The reason i think there is no CC in wotlk and why i strongly belive there might not be any in the future, is not because the trash mobs are too easy, but mostly because all the classes have been buffed too much.
In tbc a tank was considered skilled if he could tank 3 mobs at the same time. The only exception was of course, the paladin who was the only "aoe" tank but that's another story.
There for when runing a heroic or a raid, it was important for the use of cc. The tank would try and build agro on 2-3 mobs, while everething else was cc'ed.
Now a days, any tank can hold agro on 5+ mobs and aoe tank them and at the same time be kept alive by the also buffed healers.
Also, you can notice that even a sunwell geared warlock would be 1 shoted in an instance such as shadow labs if he would get 1 hited by an elite mob. While in wotlk, he would probably be able to jump up and down next to the tank and go "Lol aggro, taunt!!!"
I honestly don't see how cc can ever be added back into the game unless they nerf back alot of classes or add new game mechanics.
And for those of you who say "Blah blah blah i never got in mgt cause i couldnt cc".
Well, most classes have been given cc abilities now. Shamans got hex, druids can cc indoors etc. And mgt was NOT the only instance available. Just because they messed up by making packs of 8 mobs, doesn't mean instances such as slave pens or shattered halls were not fun.