Thanks guys, I appreciate it. Jaeger, I made a word document with an earlier thread you started, regarding protective gear; awesome thread, very useful, and it led me to some knee gear, too. (Awesome arse-burn; hurt to look at!)
I'm optimistic it'll get stronger as I use it. Realistically, I don't expect to ever be where I was, but it's gotta get better than this. I did 2 years of hard therapy after the surgery, and only got to 60% of the other leg. May be genetic "slow-ness" in healing; older brother took 6 years, but now in good shape.
I saw guys come into therapy with full knee replacements that were in WAY better shape before I was walking normally, so I think replacement beats repair any day (except they only want to do it ONCE, so they don't want to do it in your 40's). I'm just shocked to see my leg dragging after short exertions, because the rest of the body is doing pretty well at the moment. The resistance and cardio training I do gave no hint of this.
I'm just going to enjoy the moment. Age happens; no sense complaining, but no sense giving in without a fight, either. I've re-discovered so much fun in the last month with this bike, I think it's the motivation I need.