Lack of partitions is a dealbreaker for me. I will not work in a space where everyone sees everyone all the time and there is no private space. Period. I will not work on an open floor plan.
I'm not asking for my own office with a door that closes. I've never had that, and I don't expect it. I understand that I'm at work and that I have no real expectation of privacy. But we're all human, and I'm not comfortable sitting around where anyone can see what I'm doing at all times. Maybe I'm reading Slashdot for a few minutes, maybe I'm on StackExchange asking or answering something work-related, maybe I'm checking my personal email. Maybe I'm reading a white paper from a vendor, with my arm propped up on the desk while I gradually scroll through. As long as my work is being done and my employer is happy, there's no reason the rest of the floor should have a view of me, or vice versa.
Believe it or not, there's a happy medium. Partitions. Cubicles. They were implemented for a reason. I need some walls that extend several feet above my seated position and on all sides, which give me enough privacy to disregard the rest of the office for awhile. I'm never going to absorb a 30-page protocol spec if I'm exposed to every motion of everyone else around me. That's distracting. I have to have a bit of isolation in order to concentrate. I can mentally tune out things like telephones ringing, coworkers talking, etc. but in order to be truly productive, I need my cube partitions. I don't work in a restaurant, I don't want my workplace to resemble a restaurant.
This isn't about browsing porn at work, or spending all day on social media. I have no trouble with my company logging everything I do; I'm at work, after all. I just need some personal space to do what I'm paid for. I will not work on a big glass floor.