I bet you would've burnt out if you hadn't and Torbit wouldn't have happened, even if you had the idea or bandwidth for it. I've flirted with the crispy edge of burnout a bunch of times since moving to SF. You haven't really been working hard unless you've at least once seriously considered chucking it all to become a forest ranger, surf instructor or dog walker.
For my next product, if it's B2B, I'll make sure to first find an audience, people I'd like to do business with, and then find a product to make (incidentally, that's also the approach advised by Rob Walling and Amy Hoy among others, and it makes lots of sense to me now).
I'm here now, not having fun; but I also rather like eating and having somewhere to sleep ...