I think this is about disorganization masquerading as agile. I'm a big believer in Scrum. Scrum, with bi-weekly sprints and daily standups is less overhead of talking to coworkers than I've experienced at places that are not as formally agile (either not claiming to be agile, or not following a specific methodology).

I'm not a fan of open plan, but I can deal with it. It works fine when people have the sense to take meetings into, you know, the meeting rooms.