I was sleeved May 7th. Yes, they do have you up and walking the same day of surgery, and you know what? It wasn't that hard. I had my 10 day post-op visit with my surgeon this week and told him that I already felt better physically than I did the last time I was in his office, which was 4 days before the surgery. My knees didn't hurt, and walking was so much easier for me, even in just so short a time.
Good luck, everyone!