We've been working on a program to make installing and uninstalling mods super easy, and it's recently hit Kickstarter.
It's got features such as drag and drop, and we're working on a play list to make sharing easy too.

If you've got any questions feel free to reply here, and I'll respond when I can, or just head over to http://www.kickstarter.com/projects/gmod/gmod-0