Glad I have the job I do. I'm a software engineer, my job is all about meeting goals and not about hours. I work from home 4 days a week, and spend roughly 20 hours of time for 40 hours of pay. When my boss hired me he said on day one, "I don't care when, where or how much you work, I just care that you meet goals and deadlines."
Obviously some fields are different, but I just don't see how people can be happy with jobs that give them no possibility of downtime, and their managers expect simply time input and not actual work/quality input.