2 monitors is the PERFECT way to handle development in the modern age. One main monitor for editing code, one side one for looking at notes/documentation and previews. When I see peoples setups with 5 monitors, I just roll my eyes. There’s no way you can pay close attention to monitor 5 and ignore 1-4. It’s in your vision, taking away your focus. It’s the worst with these people who have their monitors set up unergonomically, where they have to twist their bodies.
I used to be one a 3 monitor guy. My home setup had a very small table, and it was quite awkward. I’m speaking from experience.
I mostly do 2 monitors.
I’m also very frequently a 1-monitor guy as well. There’s a lot of times when you don’t need to have something on the second monitor - and you just need to lock in. For coding, and writing, it’s ideal.