You might want to consider exercising more to help improve leg strength and knee recovery. I going that aquafit was amazing at helping me gain strength and mobility in my knee. Having to use a wheelchair for walking events even after a revision must be very discouraging.
I would also recommend a walking bag. I have one that I used to help me get ready for surgery and still use it. It is wonderful as it is non weight bearing and something you could use at Disney.
Here is the link
https://www.thealinker.com/

Also weight management is very important. Excess weight is just crushing the implant and making it harder to walk. For every pound you lose it takes 4 pounds of pressure off your knee