I too have bowel issues, and try and find the furthest stall away from the door most times, but many times because of my inability to hold it, I use the handicapped restroom because I need to take off my clothes/clean up, etc. I've had people give me dirty looks, or make snarky comments when leaving the restrooms, and it made me feel terrible. Because I look healthy in every other way, and I'm young, I guess people feel the need to judge. They had no idea I just spent the past 20-45 mins writing in pain with diarrhea and vomiting in public. I used to be really embarrassed by it, but now that I am older (I was diagnosed at 14 I am 34 now), I typically say something back such as : Not everyone's disability or illness is visible to the naked eye. That typically shuts them up and sometimes people even apologize. My advice is use whatever bathroom you can get to the fastest comfortably. To people who don't have to worry about where and when a flare up is going to occur, it's a trivial topic, but for those of us who suffer, we know it affects every facet of our life. Best of luck to you, and I hope your guts behave while you're in WDW.