As with all things, it doesn't hurt in the water. Out of the water it's mostly OK except when I overdo it. I didn't really do any rehab - the stuff I was given was mostly ROM stuff and my ROM is OK. My personal rehab has been teaching myself clean and jerk

. Surprisingly that's been going alright, although I've only been lifting very low weights and reps. I always wanted to be able to clean and jerk but have had at least one bad shoulder for many years.
After a long paddle session it hurts, especially in conditions like today (constant paddling for a couple of hours). NSAIDs help. That's about the only time I've been taking them, post-surf.