It's interesting really. In 2e days, I was pretty much 90% a DM.
But ever since 3e came out, I've done more playing. It has a lot to do with some of the people I've gamed with, really. I'm typically like, "I can DM, or not", but ever since 3e was out, I've mostly gamed with a lot of other DMs who want to DM. Which is fine by me, really.
I DM'd one campaign in 3e, and played in 2 others, and am now playing in a 2 more concurrently.