Like not having your Windows libraries on your system drive? Great. Use this so you don't have to move them manually.
LibraryRedirect.exe [OPTIONS]
Options:
-h,--help Print this help message and exit
--documents PATH Set Documents path to PATH
--downloads PATH Set Downloads path to PATH
--desktop PATH Set Desktop path to PATH
All options (except -h) can be used at once, but try not to set two different libraries to the same path. The system won't like that, and I'm too lazy to provide a way to reset it.
This won't move (or remove) any existing files or subfolders from the libraries. I'm not touching your stuff. Move it yourself.
Uses the IKnownFolderManager interface. COM is fun, you should look into it.