Don't let the perfect become the enemy of the good. Most people don't have the power to make their employers remodel their offices. But most people can buy a pair of headphones and make their open office more bearable.
Getting a new job is not a good solution either -- lots of tech jobs are in open offices or cubicle farms these days.
After working most of my career in open and semi-open offices, I realize now that cubicles are the most brilliant invention ever. I wish I worked in a cubicle farm. The noise is the easiest thing to deal with, but cubicles create some semblance of private space, where you don't feel the presence of other people so much.
Last time I had a cubicle, the desks were much smaller than in the open plan part of the office. Half my team got headaches within the first hour from sitting too close to our monitors.
Getting a new job is not a good solution either -- lots of tech jobs are in open offices or cubicle farms these days.