Well this is interesting, I'm in the UK and don't know any other way to be in an office, every single one I've worked in has been open plan. Seems pretty prevalent here, I've never come across the cubicle arrangement. I didn't realise there was such opposition to open plan.
I don't see the issue with open plan unless you have some sort of anxiety issue that means you can't interact with people. For me at least it means easy access to other teams and promotes inclusion as it's easy to become involved in what others are doing, learn from others, give input on issues others are having etc and I've yet to work in one that's so noisy it distracted me from my work. I don't need headphones, no one in the office of 60 people does. At its worst it's just a low murmur of people chatting or on the phone as well as the usual keyboard clatter and phones ringing etc.