To be clear, I'm not talking about people "goofing off at work" (such as myself on HN right now). Socialization is something deeply internalized so it doesn't matter if you know people are watching. I've been those people working on things late a night without anyone knowing, then I realized so much of it was sweat and stress for literally nothing.
The thing is, when you look at the fruits of the labor put in, the result is nearly null. There are people who are working very hard on things that have no real long term (or short term) purpose or function for their employers, it's work that exists because "work" has to be done. When I look at the projects being busily worked on around me, nearly none of them have any value or will make a dent in the overall productivity of the larger company. These people aren't goofing off. This is the ritual of work.
People pray in the privacy of their own home but that doesn't mean there's a god listening. The same goes for the culture of "work" in most large organizations.