Hi & welcome to the board!
Yes, you can cause creases by folding, especially with cotton batting. Some ideas are rolling them around a cardboard tube, with a piece of muslin between the tube and the quilt. You can roll multiple quilts on the tube. Some folks have a spare bedroom and just lay them on the bed, one on top of the other. There are drapery hangers, although you may still need to fold your quilt to put it on the hanger. There's also a way to fold it on the bias which will minimize creasing:
http://annfahl.blogspot.com/2012/02/...re-quilts.html