Pretty much all classes have a movement speed increase cooldown or utility, all warlocks have is Burning Rush. It's talented and we have to give up 4% health every second to use it. At least in WoD you could have Sacrificial Pact and Burning Rush together at the same time so you could soak the damage for a while. But now you have to pick one or the other.
Why does Blizzard hate locks?