There's another book called "Walt Disney World Architecture" that I found at the same bookstore (or maybe it was at the airport). It's only 58 pages and doesn't look too impressive when you see it on the shelf. In fact, there was no price tag on it because it had just come in and we thought it was a really neat pamphlet about some architecture tour. Every page has color pictures of different buidlings/sites. You could actually use it for a self guided tour if you have a car because it has maps with locations of all the buildings that are highlighted in the book.
Don't forget to go to Celebration. They turned some of the famous architects loose there to create an unusual hospital, town hall, post office, bank, cinema and office buildings. You can find a map of Celebration in the book too.
There was also a phone number in the back of the book to call for more information about architecture: (407)824-4321. I have no idea who/what department the number is for, but it might be worth calling.