I used stuns or silences here and there to help with the healers or to get mobs to group better for AoE, but hard CC being needed for the majority from expansion launch is really odd to hear especially with the players who complained about Cata heroics having CC to MoP heroics not having CC.
In ether case if WoD heroics are pointing to Vortex Pinicle for difficulty then I expect some CC and LoS. Actually I think it was among the few that had LoS pulls.