Did Keys to the Kingdom the first time in 2000, loved it. I couldn't wait to do it again, and the next chance I got was in 2004. What a difference.
I was told the difference came about because of Sept. 11 (9/11). We didn't have access to the garage that housed the parade floats-could only view from outside the garage. We didn't have access to the areas used by cast member in the utilidors, only able to view a few things in what felt like a foyer area. When we went to the haunted mansion, we actually stood outside and listed to the tour guide tell some story about different senarios the cast members have made up about what actually is the history of the Haunted Mansion. She talked for about 40 minutes. Then we went on the ride as usual, no "backstage" experience.
I hate to be negative, but it was such a disappointment.
Also did the Train Tour. I liked that and was glad I did it. Some of the people on the tour were really train enthusiast so I kind of felt like a fish out of water, but the tour was enjoyable.
I think the guide has a lot to do with the experience.