I had a private office with a door before I ever worked in an open office layout. I currently do not want to go back to having an office at all, but there's an enormous caveat there: I don't want to go back as long as the team is good. I've seen other teams where it quickly turned into a really bad situation, and can see how easily it could be a nightmare compared to a private office situation.
More important than the office layout is having a good IM setup that everyone uses, IMO. Even when you have your own office there are people who'll knock on your door which is more of a pain to deal with then just wave them away with a "not right now," IMO, if you don't have some other way of communication for trivial questions or indicating status.
The other thing an open plan has to have is lots of small conference rooms you can jump into at any time either for a discussion with other people or just to take advantage of silence for a while.
Sweatshop-style open office plans are great and even mandatory if you're an early startup, very small, full of very bright, energetic, motivated people. It is awful in any other situation.
More important than the office layout is having a good IM setup that everyone uses, IMO. Even when you have your own office there are people who'll knock on your door which is more of a pain to deal with then just wave them away with a "not right now," IMO, if you don't have some other way of communication for trivial questions or indicating status.
The other thing an open plan has to have is lots of small conference rooms you can jump into at any time either for a discussion with other people or just to take advantage of silence for a while.