I had never met a corkboard until I started talking to American writers. In Europe they're pretty much unknown (as far as I'm aware). The honest answer is: to begin with I hated it. Now, if I'm rolling into a part of the book where I'm trying to choreograph scenes, then I will use it, as you say, for shuffling things around visually. Nothing more than that. I don't think it's a silver bullet.

This may be of use if you haven't seen it.

http://www.davidhewson.com/2009/10/scrivener-and-the-mosaic-of-writing/