I don't think many people really are doing jobs they don't like. When you genuinely don't like the work, you quit. Even people who are making a primarily economic decision simply do not stay in jobs they hate.

I've yet to hear someone say they hate their job and then discover that they actually dislike the work itself. Rather, what they hate are corporate pressures, co-workers and other external forces that impede their ability to do their job.

When people feel they have control over those factors, they minimize them. When they don't, it creates the stress that leads to 'I hate my job'.