We had a bunch of mentally disabled people on our team (think low IQ / down syndrome). These guys loved their job. They felt like they were doing cool shit all day. They cheered and smiled when the food truck would roll around 11AM and they'd spend what seemed like 1/2 their earnings on snacks and drinks. They smiled nearly every moment of that job.
Good for them and good for the plant manager understanding this reality and making a good for society out of a relatively bad situation (boring ass work, people having a disability few of us could handle).