Heh. And I'm on the opposite end of the spectrum. I almost *never* 100% a game -- I just play through the main story, do a couple side-quests IF they interest me, and then move on. I have absolutely no desire to do anything more than what's needed to see the ending, generally.
There are a few exceptions to this, of course (including the game from which my avatar originates!), and those are the ones that I consider to be truly special gaming experiences for me... because the only reason I took the time to 100% them is because I found it legitimately fun to do so, and just wanted to extend my gaming experience for as long as humanly possible.