Every time this topic comes up there are a bunch of HN people saying open-plan is "clearly the worst" and that they want cubicles back. Note: this is hardly scientific. It's just your personal anecdote, ok, you don't like being around many other people and would prefer a cubicle or private office. That's fine.
However, don't discount the fact that other people exist that, gasp, actually like open-plan offices. Like myself! I'm one of those more sociable engineer types and I love the open plan bullpen at my current company, I love the bantering and conversations we have there, and I love that due to our social nature we have built a really cohesive TEAM that likes each other and supports each other. The atmosphere, friendliness, and fun, simply wouldn't be as great if we were all in cubicles or separate offices.
So now you have my anecdote too, which is of course not science. But I know there are plenty of others like me (unless I'm some sort of engineer unique snowflake out of the millions out there, which seems unlikely).
Instead of simply condemning "open-plan" as the "worst," why not try and understand why it works and helps some people and teams and why some others don't seem to like it. Maybe it's personality dependent, maybe it depends on the exact size of the open-plan area, there are hundreds of other factors that could make a difference here.