To those with 2+ monitors on your machine: What's your use case, and how much does it actually boost your productivity?
I'm mainly curious about software developers here, or anyone else whose computer is somewhat central to their life, be it professional or hobbyist.
I only have two monitors—one directly in front of me, and another to the right of it, angled toward me. For web development, I keep my editor on the main screen, and anything auxiliary (be that a dev build, a video, StackOverflow, etc.) on the side screen.
I wouldn't mind a third monitor, and if I had one, I'd definitely use it for log/output, since currently it's a floating window that I shuffle around however necessary. It could be smaller than the other two, and I might even turn it vertical so I could split the screen between output and a terminal, configuring a AutoHotKey script to focus the terminal.
Left (vertical) - Notesnook (or whichever knowledge management system I'm on at that particular moment), Signal, and Slack all tiled so I can see them all together.
Middle (horizontal) - IDE.
Right (vertical) - Browser.
This works well, but I'd enjoy another monitor for Spotify or, more likely, so I could make all the terminal, debugger, run, database, etc from my IDE full-blown windows on the fourth monitor.