I am also a" large girl" and have done disney many many times. My big issue has always been the turn stiles. Just had to wedgie thru but over the years more and more have been removed. If you find yourself in a situation that looks like a tight fit you can always use the stroler gate. I do and plenty of others do also so its not unusual. Disney does a great job of making me comfortable and the few times I havent been and I spoke up about it all went fine. Once a cast member tried to load 5 adults on a bench ride. It was just to much and speeking up solved it. Remember your the guest and resaonable requests are easy to grant. My all time most uncomfortable situation at Disney is sticking to the seat and having to "tear off skin" to get up so I just don't wear shorts anymore...maddy