It feels like it'd be hard to get work done that way too, unless you could somehow manage to forget that it was taking place. I can't really do much serious work when someone is standing behind me looking over my shoulder. If it's genuinely interactive or collaborative, sure: if they're looking over my shoulder because I'm showing them something, or they're helping me to do something, then sure. But standing behind me just "monitoring" me as I work solo? Sorta a creepy situation, and more than a bit distracting.