We saw the exhibit on Friday. While it was wonderful, I really didn't think it was as interesting as One Man's Dream. Some of the lighting was poor and some of the signs were difficult to read - even with my reading glasses on. I guess you have high expectations given that it is a Disney exhibit.
We also read/viewed everything there was and it took us about 2 hours as well.
Photography of any kind was prohibited. You were allowed to sit in the ride vehicles for Mr. Toad and Peter Pan, but NO PICTURES.
Outside of the exhibit, however, they had a Toontown Trolley that you could climb on and take photos to your heart's content. They also had tables where you could pick up some "tatoos" and Pirate names for a paper pirate's hat - along with your choice of colored feather. We had fun wearing these throughout the day.
The exhibit also boosted it's own giftshop and we purchased a $10 poster with the Haunted Mansion pictures (stretching room) with the "50 Years of Disney" Henry Ford Museum and the dates of the exhibit. We also bought a coffee mug with the exhibit name/dates, etc for $13.
My personal opinion is, if you live in the area, check it out. I wasn't that impressed with it to recommend that it is a "must see at all costs."
Just MHO.