We really enjoyed it when we did it - to be honest I can't remember if we did it last year or the year before, LOL. Our guide was great, and we were one of the first tours to use the new microphone/headset system. I'm not sure if they've stuck with that system, but we didn't feel like we missed anything the guide was saying during the tour. It was fun having the hidden mickeys pointed out to us.
MNSusan, I'm surprised your guide denied the existence of hidden mickeys. After all, they are a part of the history of the parks as well.