As/ I've mentioned before, I've been taking a bit of a break from most of my face-to-face GMing, focusing instead on playing in my buddy's Pathfinder campaign. It's been a welcome break, and I think it's benefiting me enormously.
Behind the screen, it's easy to forget at times that your mental processes aren't the only ones going; every player out there is processing information, trying to play a character, and working towards a goal (even if it's just to hang around and have fun). I think in several of my past few forays as GM, I set back a little too complacently, waiting for the players to entertain me or pick up on things. That works both ways; if the players are in the doldrums, as GM, I need to see if I can't pick things up a bit at times.
It's been very fun to watch someone else run these guys through a campaign; the current GM and I have different ways of dealing with conflict and different personalities, but I know next time I GM, I'm going to have a few new insights on how to challenge and react to those players.
I enjoy Pathfinder, and for the most part our group doesn't fiddle around for 15 minutes every turn in combat, but I'm also convinced that when I'm up again, it's going to be running a much lighter system. I wince when I think of giving up the critical tables of Rolemaster, but maybe I don't need to leave those behind; I've adapted them before, and can again. Still, right now, Shadow, Sword, & Spell, Mini Six, or possibly one of the retro-clones have to be my first picks for next time out.