There are four people who didn't vote for Vintage. Why would you be on this website if you don't play Vintage? Seems odd.
Also, "Play" has so many possible meanings. Does the question mean: 1) which formats have you ever, as a factual matter, played in tournaments or tested with friends?; 2) what formats do you enjoy to play? 3) what formats have you played recently or intend to play recently or would play if given the opportunity? Or something else? I haven't played Type Four in over two years, but enjoy the format, think about it, and would play it again if given the opportunity; does that count? Doesn't seem like it would satisfy the first possible example, but it might satisfy 3 or 2.
So, for example, some people play whatever the PTQ format is, but that isn't a format specific issue, usually. Similarly, when I was invited to the Magic Invitational, I had to play all kinds of wacky formats. I "played" them even though I wouldn't ever play some of those formats outside of the Magic Invitational. Supposing the invitational was held recently, I would have, technically, "played" those formats, but not really.
The question is very ambiguous.
I'm pretty sure Nick meant "Do you play right now with any regularity?" as opposed to "Did you previously play regularly?" or "Do you wish you could play regularly in the future?"
QFT; that is, indeed, what I meant.