Living in L.A area (I live a couple miles from Disney Corp offices and the Disney Channel building), we have what we call Disney Freaks. They are adults with annual passes to Disney that will go Disney Land just for dinner and one ride a couple times a month, wear the Disney clothing and watches. One lady that I used to supervise is a Disney freak, for X-mass 20 years ago I got her a jumbo ornament with Pluto on it. she still has that front and center every year on her tree.
So plenty of adults into Disney. Myself, I think I'd go nuts on a Disney ship with all the kids and Disney stuff. I have heard that the Service, food and ships are in a class above the regular cruise lines but the price is in a different ball park also.