Keep in mind that some dorms have restrictions on lofting, e.g. Slusher, which only allows you to loft one of the beds.
I lofted my bed last year, but in my experience, I never really had a use for all the extra space, since I didn't bring very much. I had clothes, laptop, books, fridge, and not much else. Most students will want to bring extra things like chairs, television, containers and other equipment, so they will find lofting to be more useful.