As a counterpoint, I'm usually the guy that people ask questions to, so for me it is an obvious productivity drain. Working from home however isn't a solution either, because somehow I cannot make the mental switch to "work mode" as easily. I would love a separate office with a door that closes so I could control interruptions more effectively.

The irony is that at one point for a two month crunch period they did give me exactly that (repurposed a meeting room for me and a team mate who was not very talkative). Most productive two months in my entire career. So, management clearly knows the open plan is detrimental to productivity. And yet...