As a person who has OCD in real life and is not ashamed to admit it, I can say I have never felt compelled to find every single cache in my area -- lame or long hike -- there's actually one people have asked me to do but I don't because I don't feel as I will have fun with it.
However, I do obsess over somethings, such as finding certain caches. When most of my friends have given up, I just keep on going, and most of the time I'm not able to find it.
Now for those people who are addicted to geocaching (I think I'm approaching that point, too), I dunno.
- JD