I've done the Walk in Walt's Footsteps tour a few years back and enjoyed it very much. It does not go 'backstage'. A lot of the information was about the creating and building of DL and lots of info about Walt. I think it's about 2 1/2 hours.
Now I'm searching to boards looking for info on the nighttime tour that starts at TOT and ends at Haunted Mansion......I suppose I could just call Disney, but what's the fun in that? Hmmmmmm. I think I saw something about it in someones trip reprt......better go check thouse out too!