I've been both flying and learning how to be a controller; I've progressed with both to the point that I can actually land an airplane now, and I am ready to begin actual training for doing controller work. The study and practice required to be a VATSIM controller is pretty intimidating, but it's also a lot of fun. And why shouldn't you learn something and have fun at the same time?
So, if you're interested in flightsimming or virtual air traffic control, VATSIM is for you! You can find them at vatsim.net.