I like to GM and I like to play. I GM much more often, though, because I am always up to trying new systems or settings and just set up a one-shot or campaign, or simply get some ideas that I just need to play. But I am always happy when a friend decides to GM. The good thing when you are often GM: there usually is a lot for me when others do.
I'll get to play EotE next month and I am pretty stoked. Of course, I will GM three Star Wars campaigns/one-shots, too, so the ratio is 1 to 3.