It's not just Disney. This nickel and dime approach is prevalent in the travel industry.
Airlines charge for baggage, priority boarding, premium seats, seats with more leg room, wifi access, streaming services, meals etc. If you want to get through security and/or customs faster we got you covered there too: for a nominal fee you too can travel more efficiently with TSA Pre-Check and Global Entry.
Cruise Lines who have marketed for years as all-inclusive vacations are anything but. Your drinks cost more, your excursions cost more and guess what? There's a mandatory amount you must tip. And hey, fancy a meal at one of our signature restaurants....sure...that'll cost more too.
Rental Cars with their insurance waivers that nobody really needs, satellite radio and GPS charges.
And hotels...with the parking fees, resort fees, movie fees, mini-bar fees are just a small part of the bigger picture.
American Airlines doesn't really care, nor does Royal Caribbean, or Hertz, or Marriott. They may give the impression they do - but they don't, really. Unfortunately neither does Disney. If you or I decided that enough was enough, and we were never going to go to Disney again. Think it makes a dent? Sure, if enough people got in this mindset it would - but it's not happening over parking fees.
Edited to say: I'm correcting my statement on Rental Cars. If you are renting a car in Europe or Internationally....absolutely take the insurance waiver. Trust me on this.