I just moved a few months ago and everything I own fit in the back of a 87' Volvo wagon. And that includes my bed.
There sure is one -- and the minimalist trend has a little to do with that tendency, but it's something much rarer than hoarding.
A lot of people do the "anti-hoarding" thing with emotions, memories, friendships and relationships, though, just letting them slip through without affecting them.
Coping mechanisms, if I ever saw one...