So try this first...on a different folder with a couple of different albums in it.
Ahh never mind...that didn't work either...
It's a daunting task...that within a few hours you can probably solve yourself.
Here's what I do when I run into similar situations due to, um, um...bad file management.

Sort everything in the folder by artist first.
Scroll clear down to the bottom and starting with whatever artist is last, create a new folder for that artists and copy all files for that artist into that folder. You'll come back later and create individual album folders.
If you have various artists/soundtracks/compilations, you wanna go through and handle those first so your not separating them into multiple folders.
Converseley 30gb? Send them to me!!! I'll do it for a few bucks!