That's interesting, but it's a very different approach to Pathogen, and it's very much a matter of taste IMHO. I prefer to use git submodules directly or through a general-purpose scripting language and just have the vim component load my plugins.

Exactly. I use homesick to version and sync all the config files in my home directory across machines (linux and OSX alike), and git submodules already solve the problem for me.