I'm not gay, so I can't say from first hand experience, but heres what I think.....
I figure that you have a better chance of people leaving you alone in Disney because people are generally happier in Disney because, well.... There in Disney!
However, if you are from a major city like San Diego or something, and used to being open because no one there cares, it won't be the same. There are people visiting Disney from San Diego, and Kentucky, and Alabama, and people with grandparents who walked in KKK rallies, etc. - people from all walks of life. I say (and this goes for straight people too!!) that as long as you are not sloppy kissing your partner in the middle of MK, you'll be fine! Its sad that you have to worry about something as trivial as holding your partners hand in public.... maybe one day no one will have to worry about something like that.