I've had my own office and found it lonely and boring. I never got less work done than at that job. Everything took longer because I had to stand up and walk to talk to my team. Instant messaging sort of worked, but if they didn't respond immediately, you didn't know if it was because they missed the message or they weren't actually in their office.
Because I hardly ever talked to my team members I never felt any real friendship or camaraderie with them. That made it harder to get help when I needed it and made my day a lot less enjoyable.
I find that I thrive in open offices. I don't even need headphones to concentrate. Everyone is different I guess.