Some people love their work. Work is as interesting to them as any hobby they might have. I count myself among those who love their work. My boss has a hard time getting me to take my vacation time. Anything more than 4 days away from work and I start to get fidgety. Sure, I have my other hobbies, but work is my favorite.
what is your job?
mmm... This reminds me of the J/P split in MBTI. Its not exclusive, but Js tend to like work and Ps tend to like play.