You are correct they are called companion restrooms, but just about all the bathrooms at Disney are able to accommodate for wheelchairs except for a few. I have traveled several times with wheelchair bound relatives and they never needed to use the companion restrooms. I only started using them when I had my DD6 so that I could have her in the bathroom with me and now with both kids we all go in together. I'll go, my DD6 will go and then I'm able to use the changing table to change DD1.