zztimeout, if I understand your situation correctly and if you're typical for that condition, I think there's good news and bad. The good news is physical: Your good shape pre-op should stand you in good stead post-op, and you'll probably regain fitness much faster than if you'd been a couch potato for a long time (either because of CHD or not). (Of course, there are no guarantees, and lots of "bumps" to steer around.) The bad news is psychological: Even if your recovery is a month or two faster than average, if you feel great now, completely asymptomatic, it may seem like an eternity until you feel that good again, sorry.
I was just barely symptomatic, for a few weeks pre-OHS. As I've posted a few times, I would have bicycled to my surgery, except I couldn't figure out how to get the bike home afterwards. Now, almost 5 months post-op, after a couple of ski weeks in Whistler and a LOT of miles of (BORING!!) power-walking in a Cardiac Rehab class, I feel just about back to my asymptomatic condition, a couple of months pre-op -- still out of shape, but feeling normal while I push (e.g., bicycling hard) to get back in shape.
4.5 months is FAR from an eternity, to mostly-recover from surgery as invasive as OHS, but for people used to being as active as I've been, it has seemed like a long time, even with quite steady improvement along the way.
I had some control over the timing of my BAVR, and I'm still idly puzzling a bit over it: If I'd gone in maybe 4-6 months sooner, I might have completely skipped the MV repair (and the 3 months of ACT nuisance) -- BUT I would have gone in with ZERO symptoms, and the rehab might have been much tougher on my spirit. No chance to change that decision now, but I think I probably wouldn't, even with the chance, FWIW.