I have worked in an open office plan and simply can't work with people around me talking. I had to wear my headphones all day every day. I would never accept a job in an open office again.
I got marked down as not a culture fit when at an interview with a digital agency - I pointed out that the camped noisy office environment (all working on laptops no double screens and popper docking stations) would be effecting their efficiency.
The role I was going for was as a technical consultant to improve the quality of the work - go figure
I have an office of 4, which is bearable. I have gone for a few interviews recently, and open plan seems to be the norm. It seems difficult to find a productive working environment.
I was way more productive when there were just two of us in the same office. That was when the organisation was just starting out.