I do think there is an interesting human behavior about value in the outcry. Disney has raised the cost of many things periodically for years and people generally are ok with it, however the charging for something that was previously free drives them crazy. If you had taken the same $24 a day and tacked on to Poly / GF / Yacht club room rates, no one would have even noticed or cared, but by calling it a parking charge, it is an outrage.
I believe the lesson is people do not put any value on something given to them for free. Person A stands inline for 4 hours and drops $200 on a concert ticket, they will move heaven and earth to make the concert. If for some reason they can't make it and hand the same ticket to Person B for free, they may or may not make the concert. It is still the same event, but since person B received the ticket for free, they really don't value it as like the person who made the value/cost decision to buy it.
We had a slightly different problem at a company I previously worked. Upon our companies inception, leadership made a poor decision to give a key service for free to their initial customers. Over time, the cost of providing that service became severe, the company started to lose money, and people were losing their jobs. The company was in danger of going under do to the poor business model. Eventually they changed and told the customers that we were going to have to charge for this service that they had been getting for free for years. Customers nearly lost their minds. They just didn't see they were getting any value for this new charge, because this service had been provided to them for free for years. We even showed them that our rates were going to be lower than all our competitors and it was not gouging the consumer, but they still were seriously considering going to a competitor to pay more for the same service. In their mind, the competitor's service had to provide more value because our competitors had always charged for it where ours had always been free.