My husband and I have done all of them except Italy. I believe America & Canada do not have it at this time. It's definetly better with a few drinks for the adult crowd! If you go fast, it's about 20 min., but you can stop and start at your leisure.
My favorites were China, Japan, Germany and England. They're all fun though, especially if you're a regular visitor it's neat to see all the new stuff they put in for this. I like how they make you explore the pavillions and discover things you may not have noticed before (besides the new stuff).