Interesting. Although these numbers don't really mean anything without something to compare them to. As I've said in the past, Disney does not exist in a vacuum. They aren't out there all on their own, and so you have to compare them to something to know whether they're outrageous or staggering or right in line or whatever.
The change in prices (on average for all the resorts you listed) in the 18 years from 1994 to 2012 at Disney is about 81%. Or about 4.5% per year.
What's the change at other local hotels / resorts during that timeframe? (That's still a little bit wonky, since Disney added a lot to its parks and resorts in the past 18 years, and some of those increases are directly related to additions or improvements in the parks, but it's still a relatively apples comparison.) It's tough to relate it to Universal hotels or SeaWorld hotels -- since Portofino et. al. haven't been open as long and SeaWorld doesn't have any branded hotels -- but I'm sure there's an average hotel rate on record somewhere for Orlando that can be compared.
I'm not looking at exact RATE so much, since whether Grand Floridian is worth $405 or whatever is very subjective. But if the percent of increase in the central Florida market as a whole has gone up 4.5% per year on average, then Disney's increase isn't staggering at all. If Orlando as a whole went up 1% on average, then it might be.
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I can give some numbers.
Radisson Celebration, 2002 $69 in May
2011 $79 in May
It is about 1.6% average a year.