I wish everyone would give up on the "increases collaboration" thing and just admit that open-plan offices are about shoving as many people as possible into a given space
The increased collaboration is a plain and albviius benefit for me as a developer.
A site crushing issue was solved in 30 seconds due to me overhearing a conversation in ouropen plan office. Without that it would have been at least 3 hours of pass the parcel to work out what incredibly obscure thing with timezones had happened.
You can pay me to focus, or you can pay me to listen to conversations and look for opportunities to help. You can't have me do both.