My first experience with this was attending a conference in Harrisburg. I was representing my employer in a vendor's booth. I waited for all the participants to go back to the conference before using the restroom. I was able to push the door open easily [ a surprise because they usually have 1,000 pounds of pressure keeping it closed]. There must have been 12 'regular' stalls and 2 accessible ones at each end. All the stalls were vacant except the accessible stalls. As I tried to wait patiently and the time passed, finally, the gentlemen both finished at about the same time. Neither had a mobility impairment and I wondered why they couldn't have used one of the other stalls. I held back my accusatory look and rolled in.
The previous user had set up camp in there! Newspapers were folded over the grab bars, coffee cup was on the paper dispenser and tell tale ashes on the floor from a smoke. Over the years, I have discovered that this was the attraction to the accessible stall. You could comfortably camp in there and casually take care of your personal business. It's like having your own office, too. Make calls, email, text, etc.
I guess these campers have never experienced having an urgent moment. Difficult not to wish that moment on them...