I have never taken one to Disney before but plan to for our upcoming trip. We are just going to use our regular case with shoulder strap. It also has a strap that allows us to slide it onto a belt, etc. When we bought the case, we took the camera with us, tried the fit for the camera within the bag as well as how it felt wearing it. Are you used to carrying it around? If so, I wouldn't think it would bother you. For instance, my parents travel a ton (hiking, camping, museums, etc). My dad ALWAYS has his, sometimes he even carries two. He's a big photog. It doesn't phase him a bit to carry them all day.
One more thing...I do intend to bring a large ziploc to keep it dry in case of rain.