We were also on this cruise. We had a 10:30 check-in, were dropped off a little after 10. We were near the front of the 10:30 line and heard several times that they couldn't begin boarding because all the departing passengers were not off. That said, we were still on a bit after 11. We went straight to the Boot and Bonnet and made meal and show reservations before lunch.
A couple other thoughts:
The only other time we stood in line was in the MDR on lobster night.
Sawall three major shows and thought they were terrific.
Loved our central park balcony and were regular pre and post dinner visitors to the Trellis.
Had one of the best meals ever at 150 Central Park. Great meal also at Chops and a lot of fun at Wonderland.
Getting off was incredibly easy. Walked off (no lines) at 8:20, breezed through passport control, picked up our bags and met our daughter in law at 8:30.