Don't worry about it, Domo. A lot of us here are such super Disney nerds that there's not much information like this that we don't know. A lot of people here wouldn't know this though, and it is interesting. I had known for a long time about the "underground" tunnels, but it wasn't until I was on here regularly that I learned that they weren't actually underground and, as mentioned above, MK is really a huge two-story structure.
I refuse to do the tour though because I worry it will spoil the illusion. As far as I'm concerned it's all magic!