My employer built a new building that we moved into about a year ago and insisted on a open floor plan for better collaboration. Our cube walls are only about 3 feet high ad have glass on the last foot. It does let some light in which is nice but I really dislike the lack of privacy. I find that I get much less "heads down" time where I can zone out in my cube cave/space without constantly being distracted by people walking by, noises, laughing, phone calls etc.
If I want to collaborate with someone I'll call a meeting or just walk over to their cube. I really dislike open work spaces now.... In fact, If I were to change jobs, I think that would be one of my requirements. No open work spaces for me.