While I find it incomprehensible that anyone could cope with two main courses, that is me. In any case it is completely unacceptable that the crew should appear to regard you with disdain. I hope you don’t intend to give them an extra gratuity.
Yes, I got the impression few people knowingly had it on my cruise. There didn’t seem to be gaps in the restaurant or corridors full of trays. I was unlucky and in a small minority.
I do sometimes adopt the regime of Cissie Chandler, wife of Raymond, and incorporate dancing around into dusting. She also took most of her clothes off, which I do not emulate, but then she was in Southern California.