I've been reading up on some of these and starting to go back through previous years.
One concept I've been thinking about is something i think I heard Jared Logan mention (Stream of Blood, Glass Cannon GM). It was running combat as 3, 2, done. Ie only ever three rounds of "what do you do" and then the overall outcome is adjudicated which is a cool idea. Obviously not for games like pathfinder etc where combat is largely the point of it all, but i have less and less interest in running those kind of games.
It's social interactions and puzzle solving ideally for me! Or extremely lethal stuff like Mork Borg where speedy combat is somewhat built in