Comment by bee_rider

"Powered by the apocalypse" based games are a great suggestion I think. I've only played, rather than DM-ing, but from what I could see it seemed like they really emphasized the player driven nature of the experience in a way that, at least to me, looked like it should reduce the amount of DM prep required (definitely interested in DM perspectives though, maybe the improv nature of the system makes it more stressful).