Woohoo! Pictures!! Send pictures!
Personally, I think the organized stash is a myth, and what pictures we see on the Internet are heavily photoshopped to protect the reputations of quilters in the rarified atmosphere of fame.
Down here in the trenches, though, we're so busy making quilts that a stash MIGHT get organized two or three times during a quilter's career. So, yes. Send pictures!! It will do us all good to see that it really can happen.
No, I haven't tried the comic book backing boards, but another quilter has, which is how I learned of them. They'd probably be okay for fat quarters, or maybe a yard, but I'd still use cardboard bolts for backing yardage, or dress lengths.