I really enjoyed this experience too! My son and I both took the Segway tour back in October. I was afraid I'd be a little impatient with the instructional portion of the program (I knew I'd be so anxious to get out and ride!). . . but I really didn't get bored or impatient, because learning how to operate the Segway properly is fairly challenging. They have you practice stopping and starting, maneuvering around cones, etc., during the inside part of the tour. As I said, it's not as easy as I had expected, so I was glad to have the first part strictly for instruction.
Riding around the countries was a blast! I got to see some parts of the World Showcase countries that I didn't even know existed, and I've been there probably a dozen times or so.
As someone else mentioned, by the end of the tour, people are coming in to World Showcase. In my opinion, that definitely added to the fun, because people's comments were like "I want to do that!", "How do I sign up?", etc. We were definitely the center of attention in Epcot for those last 20 minutes or so!
Very fun experience, and one that I plan to do again.