I'm curious how other GMs feel about the subject of prepping for your games. Recently, I've been finding the prep of our infrequent games pretty exhausting, on a par with preparing for a big exam. I do tend to be a perfectionist of course, and probably spend far too much time on it, but there seems to be something particularly difficult about the whole process. I enjoy the game itself, but am starting to begrudge the time it takes up between games.
Perhaps there's less detail in the published adventures, perhaps the game is just much more complicated than previous versions (too much choice?) Hell, perhaps I'm just getting old and my imagination is drying up.
If I happen to whinge to my players a little, they say 'wing it more', but I'm 90% sure it's the extensive prep I do that makes the games so enjoyable for them.
So what do you lot do? Wing it, prepare until you're exhausted, or somewhere in between? Discuss.