I envy you! I would love to like my job as much as you do.
The problem is not that I don't like my job. I like it. The problem is all the things I CAN'T do while I'm at my job.
Don't you want to devote your life to something else that one single thing? A 40 hours a week job takes the vast majority of your time that's not already taken by your basic needs (sleeping, eating, hygiene, etc.).
I cannot think of any activity that I would like to devote 40 hours a week of my time until I'm 65 years old. But there's a long list of things I would like to devote some time, but don't have time to if I work 40 hours a week: learn modern theoretical physic, sail to Antartica by myself, speak spanish and russian, travel the silk road like they did 700 years ago, read more philosophy, spend a lot of time with my future children, train more, learn mechanics, be good at repairing or building stuff, read the bible, quran and the torah, live in Bolivia for a year... and it goes on and on and on...
Don't you have that feeling that you're wasting what your short life has to offer because you have to do the same thing over and over again every morning? I do. Don't tell me your work is always different every day (like my coworkers always say), unless it allows you to do everything in the above paragraph, and more.
I'm not trying to be a jerk. I really want to understand why a lot of people genuinely like to devote so much time to one single activity.