I don't understand how "You have to remember to put all your files in a special folder" (Dropbox) is much different than "You have to remember to put all your files on a special drive".
I link my desktop to Zumodrive. So any time I create a new folder or add a file to my desktop, it is available to me on all my computers. Same with my iTunes music. I dont have to move anything any more.
Before the folder linking you had to move or copy studd into a special drive.