I would have probably read over a thousand books by now. Hell, maybe two thousand.
I'm sure I also would have written far more than I have, but I don't know that the quality would have been anywhere close to worthwhile.
Besides that, I probably would have watched a lot more TV. All of X-Files and all of Star Trek, for a start. That'd be equal to, what? 3,000 episodes worth of anime? When I've watched well over 7,000? Scary.