I can look at the engineering area at any given day and see every member of the engineering team with headphones/earbuds on. Slack/IRC/Skype for Business gets ignored...why? It allows us to focus on the task at hand, without the noise of the office around us.
One of the best startups that I've worked at -- culture wise -- had a policy of two days a week, there would be no meetings, chatter around the office, or loud noises in the afternoon, and they'd play something that was rather chill/relaxing that everyone would agree on...and it really helped with productivity: the number of commits went up on Tuesdays and Thursdays because we were able to get things done without the hassle of anyone bothering us but the tasks at hand.
If open plan offices were designed with sound masking/dampening, the correct number of bathrooms per person (because, they were originally designed for cubes, not open seating, there are never enough bathrooms, it seems), the correct network planning (limiting your DevOps guys to one network drop always sucks when we're the ones pushing around gb+ images), and parking (because open plan seating usually implies that they're trying to stuff more people into a smaller space, so, there's never usually enough parking for the area) I would not really have an issue with open plan offices. I have a great pair of noise cancelling headphones and they work well for me.