Oh, Haderer. Is nothing sacred to you? Disney, and Disney World, market themselves as the happiest places on Earth. They do everything possible to live up to that reputation, too. The shows are incredible. The staff never stop smiling. Everybody who works there does everything within their power to make sure you have an incredible time. But we suppose the party has to stop somewhere. The people in the character costumes eventually have to switch off, go home, and experience the same human boredom and concern as the rest of us.
This could be a metaphor for people you know. Just because somebody seems permanently bright and cheerful when you see them doesn't mean they are when nobody's watching. Always remember that you never know what anyone else is going through, and also that nobody knows your story unless you tell it. Never suffer in silence. Even if you're a cartoon mouse!