Most people do wear headphones... I have to say that the problem I have with my office at the moment is the complete opposite! There may be 15 or so people in there, but sometimes it is SOOO quiet! (Probably cos everyone has headphones on!)
I feel conscious of making telephone calls sometimes; it’s like being in a library!
I have had the constant nattering issue in the past though and it is VERY annoying!!!! (One person in particular who just used to constantly natter to anyone who was listening... argh!)