I very briefly worked a job like this when I was in college. I would work the concession stands at a huge football stadium with around 1,000 temporary workers on a given game day.

The wage and hours were terrible, but it was the absolute dehumanization that stuck with me. No body knew your name or particularly cared. You would walk in during the morning, flash your badge and get assigned to a particular stand. Every day it was brand new people who you've never met before with a brand new manager. There was obviously no room to move up, because you never had a chance to build a track record with anyone. There was also just plain disrespect on the part of the company towards its workers. We would spend 2-3 hours after the game just waiting for permission to go home. I can't imagine spending much of my life in a job like that, it was just horrible. But clearly there were enough people who had to do it, because there were many 40 year olds I worked with.

People who've never worked these jobs tend to read this article and assume that these articles have a hidden agenda: raising the minimum wage or some kind of socialist initiative. I read it differently, as a reminder of the depressing underside of the US economy.