Jeff,
I am amazed too. The surgeon said that there wasn't any significant damage to the tendons yet, there was some fraying but no big tears, and that with the bone spurs removed I would out of the sling and moving my arm pretty quickly. He was right.
I'm still sore and swollen from the surgery, but doing well. I think that having the surgery before there was any big damage from the bone spurs was very much to my advantage.
That being said, I had a torn rotator cuff in the same shoulder 25 years ago from playing baseball. It took more than 6 months to recover from that rebuild job. So each case has its own quirks.
Do know that with time you will be as good as or better than new. Good luck and keep updating all of us on your progress.