I don't want to be a debbie downer, but we had an awful experience on our TA aboard Jewel. Diembarkation was extremely slow. They blamed it on lack of customs and immigration employees. We waited for what seemed like hours just for our numbers to be called. Finally, every one just started moving without an announcement. We were worried we would miss our flight. It turned out allright but with a lot of stress. This was 10 years ago, but you can never count on a specific time.
It is easier for everyone if you allow a wheelchair or scooter to get on an elevator first. Standing people have more flexibility and can then find a spot on the elevator. I am shocked at the responses on this thread. Normally, people are much more supportive of the mobility challenged.