Ah, yes, I missed the 11th disc, titled Street of Fantasy, Tokyo Disneyland Musical Walking Tour.
Regarding Splash Mountain, the tracks are totally different--different voice actors, etc.
Country Bears is in Japanese except for one or two vocals--Teddy Berra is in the original English, but almost all the others are in Japanese.
Most of Pirates and Haunted Mansion are the original English soundtracks with a few Japanese voice actors (the Ghost Host is done in Japanese). But these ride-throughs are not on the CDs. Shows that are mostly musical, like Splash Mountain, Country Bears, and Pooh's Hunny Hunt, are more likely to have lengthier tracks on the CDs.
There are, it should also be noted, more than one version of the boxed Treasures and Fantasy set. I purchased mine at the park two years ago, and saw a different, earlier set on eBay about a year ago.
Yes, the Japanese are crazy for shows and parades. They start to stake out spots along the parade routes several hours in advance.