I dunno, when I was younger and bought albums I sure as hell would listen to them over and over - maybe in part because I didn't have an unlimited supply of new music. Even today when I encounter something new these days I'll listen to it a lot. I think "exclusively" probably falls a bit on the ADD or OCD side, but "listening to one album more than everything else combined" is definitely quite common.

As with everything in life, there is a very wide range of ways that people interact with music.