I notice a lot of people here feel uncomfortable when other people can see their screen. I completely recognise that feeling, though over time I learned to ignore it, and these days I just don't care anymore.

That said, there has been one situation where it was actually an advantage that everybody could see our screen. We had the most terrible working spot you could imagine: next to an intersection of two corridors, in a room that was open on one side, had a glass wall on another, was shared with another team, and had only a single window. A co-worker was sitting with his back to the intersection so everybody could see his screen. At the time, we were playing around with Neo4j, which has a nice graphical browser interface, and everybody seeing that, got us into contact with a couple of other teams we didn't know before that were also using Neo4j.