Offhand, I can't imagine why anyone would really need to forcefully drive their hips forward to accomplish any movement. Just do the fricking movement. if your glutes weren't working you'd fall down.
Also, the danger (I see) in giving such a cue is that trainees so often receive the cue and then go on to exaggerate the motion. I Rremember watching Chad Waterbury cueing a trainee doing deadlifts. The guy literally looked like he was performing a hybrid deadlift/backbend movement ... with Waterbury just sitting there watching it.
As an aside: Waterbury has probably forgotten more than I'll ever learn on neurophysics. And guess what he's currently, fanatically into ? The Warrior Diet. In the space of a year he went from six meals a day to gorging once a day. I suppose that because I'm a fitness trainer I'm less predisposed to miss this kind of stuff.