I'm glad you bought this up. We took the fall fantasy cruise in 2000. I don't remember what we paid, but I'm thinking it was well under $3500 for the 4 of us - (2 adults and 2 kids at athat point in time)
To be honest I keep looking at the cruise prices and no way can I justify paying what they want for a 7 day cruise for the 4 of us even with discounts.
I love Disney, I'm DVC but I have to say we'll be going to Alaska on Holland American before we sail on Disney again. Sad, I wonder how many other people they've lost because of their higher prices.