I just went on the Walk in Walt's Foosteps tour (9 days ago) with DH; it was fantastic, although I would say it's geared toward adults. (The day we went there were only 4 of us, but I saw our guide, Nathan, giving the tour the next day and the tour appeared to have a range from 8 YOs to seniors. I do think the tour guides are pretty good at addressing the group's interests, but keep the tour's focus on the biographical/theme-park connection in mind when you make your decision.
On our tour, we spent quite a bit of time on Main Street. Because the group was so small, we could ask lots of questions, which also put us behind schedule. We got to see Club 33 (yes, lobby only), but didn't have the time to see the Tiki Room. We did get to go to the Opera House (and see the film celebrating Walt) and ride the train. Lunch, at the Disney Gallery where you'll be for F! Balcony seating, was filling and refreshing. There are pins for all participants. [Do know that this tour doesn't offer a look backstage or reserved seating.]