I read recently that the myth of the "dream job" tends to make you put less emphasis on your current job and forget the hard work necessary to start your own business. Once you look past the fluff like "have the courage to follow your dreams", you find that most people who did so were already skilled in a valuable and rare field, which is what they went and used to start their dream job business. The other half of the argument said that people who perceive their own jobs as a career or even a calling are more likely to be satisfied where they are, and they found some very ordinary jobs with very satisfied people to back it up.
Mokalus of Borg
PS - So the moral is that job satisfaction has a lot more to do with you than your job.
PPS - Unless your job involves regular abuse or questions about fries.