It's the total cost to me - doesn't matter if they call it parking fee, resort fee, wifi fee. I add it up and consider that the total cost of the room. $800 is an eye popping number for parking fees! I know there are onsite benefits, but if the total cost (including
free dining) wasn't worth those benefits to me, then I'd go offsite.
Have you looked into the condos near Disney? You could rent at Windsor Hills a 6 bedroom, 5 bath house with pool and hot tub (and club house pool with 2 water slides) for $250+ a night (I'm sure xmas is higher). No parking fee but not sure if 5 cars allowed. Just an example. Its about a mile from Animal Kingdom, very easy drive to the other parks too. Near regular priced grocery store, McDonalds, Target, all chain restaurants. Just thought I'd mention that. You could rent 2 houses next to each other if you booked 6 or 9 months in advance I'd think.