We haven't had a few cruises , DH was not keen initially but has enjoyed them . Yes lots of people but I have never had difficulty finding somewhere quiet to sit and read. I love sea days , love the ocean ! Dressing for dinner is not a big deal , some people do go ' overboard' excuse the pun!! but that is not necessary. I hate dressing up , so for me it's a long black skirt , no tights - flat comfy shoes and two or three different tops- job done! I am not remotely interested in sitting at the captains table either! Love waking up in different places , exploring new places then returning to the cool ship. I am always watching my weight and yes it would be very easy to put too much weight on. However in my experience fresh fruit , salads and cold meats are available. We do enjoy cruising but don't have many , we love our own country too. Think the Covid situation will curtail our sailing for sometime yet though. I can imagine why people think it would be their worst nightmare, but if they try it they may be surprised!