Always the same thing people miss in this discussion. "Well, my local ballpark charges $20 for a hot dog!"
You aren't expected to eat three meals a day at a ballpark, for a week at a time. Or most other amusement parks. Or pretty much any place else being bandied about.
Disney's whole shtick is to keep you on property the entire time, so when they keep increasing the prices the way they do for every sip and morsel you eat in a week's vacation - yes, it's going to be shocking for some people.
This is particularly true for quick service - which for the most part is sub-fast food quality (more like school cafeteria level).