It's been one year since I joined my current employer, and we work in a big open floor. There are around 30 people in this big room, and its very distracting and we have no privacy. It is weird as someone who is setting next to me or walking by can just peep and see what I am doing and read my IMs.
Since this is my first big office, it has been terribly distracting and has really crashed my productivity.
But then again, this is a big company, and office space is pricey. I don't expect them to give us all more personal space of our own.