It sounds really strange to say that, but it's true. Although I run Swords & Wizardry on a regular basis, I've yet to play in a session as a player. That's a pretty big difference.
Heck, from 81 or so through 97, my first "age" of playing RPGs, with the exception of my very first session, some later whacked out session with 12+ players and 2 DMs and convention play, I DM'ed as a rule when it came to (A)D&D. Rifts and Battlelords I gladly joined as a player, but pretty much everything else I was the GM - easily 4 out of 5 sessions found me behind the screen no matter the game or the genre.
Upon my return in 2008 via Fantasy Grounds, I was a player, mostly because I couldnt figure out the interface as a DM. I didn't want to run 3x, I wanted to run classic D&D with my own adventures, and that was damn clunky for what I wanted it to do. I could, however, embrace it as a player, and I did get a chance to play in extended Dark Heresy and Castles & Crusades campaigns.
Move us up to D&D Next's beta and G+ Hangouts, and I was again playing as a player - until DM burnout and a broken game system led to me running ACKS, then AD&D 1e / OSRIC, some Ambition & Avarice and now Swords & Wizardry Complete. I have recently been playing in some of
+Joe D 's excellent Blood Island Campaign, as we rotate the DM's chair. Joe runs a damn sweet LotFP Weird Fantasy (more heavily houseruled than even my S&W campaign).
Next week,
+David Przybyla is going to run a session of S&W for us as we playtest something that he has written. I jumped at the opportunity, as I have yet to play in a session of S&W as a player. So, in a way, it will be a bit of a playtest for me too ;)