There was a
thread about a bathroom website on the Theme Parks Board. The person who made the website visited all the bathrooms in MK (at least all the ladies rooms), took pictures and listed how many stalls were in each, plus how many handicapped stalls. Someone else took the information and
made a table with the information.
I did a quick count of the stalls listed on the summary and came up with a total of 206 regular stalls and 22 handicapped stalls (some of which I know from personal experience are not large enough to fit a wheelchair in and close the door). I'd just like to point out that in some of the larger restrooms, with many stalls, a person who needs the handicapped stall can have a very long wait, even while there are stalls empty. While waiting, a person who doesn't have a need for that stall has 100% chance that they can use the next stall that opens up. Depending on the size of the restroom, a person who can only use the handicapped stall, might have a little as a 1 in 20 chance that they can use the next stall that becomes vacant. (Whether they need the stall because they have a wheelchair, an invisible need or some other reason).
We just came back from WDW and had to wait for over 10 minutes for the handicapped stall on 3 occasions for someone who was in the stall when we arrived - twice at MK.
Two of the times, DD and I were in the larger bathrooms at MK that have 2 bathroom areas. During our whole wait, there were always at least 6 regular stalls empty.
One time, we could see a 20s something lady (a small woman, not a Pooh size person) who was changing from shorts to pants in the evening. Even though there were many empty regular spaces, several people asked if we minded if they used one of the empty stalls. I explained we were waiting for the handicapped stall since it was the only one we would fit in. When the lady came out, she apologized profusely. The other time, it was a mom with 3 children, again changing their clothes. When they came out, they didn't say anything, she and the kids all were looking straight at the ground.
Most people with disabilities don't expect the handicapped stalls to be "reserved" for their use. And, it is one of those things that was originally put there to provide accessibility for people with disabilities, but may also be useful for other people (like curb cuts). My little plea is to keep the numbers of handicapped stalls in mind, think about whether it is a choice or a necessity (given your situation) and keep in mind that there are people who don't have a choice of whether to use that stall or not.