I'm the same type of person. Loot, loot, loot. Even when in the end of the game, having near infinite ammount of currency and epic weapons, armour, magic (you name it), I still pick up everything (and yes, a house with a chest is a MUST). I think it's a kind of OCD behaviour.
Also, when in dungeons, I have to explore all the side-roads before going the "main-quest" way. And it pains me, when I don't know which way leads where and I have to return back all the time.
Also, by the order of the Ordo Xenos and the holy will of the God Emperor, I submit you to death, filthy xenos Tau scum! *BLAM* *BLAM*
(Sorry about that, my triger finger gets twitchy)