Web dev here - I use to have three monitors early on in my career. Two side by side and one vertical for a terminal. Then eventually two and now just one large 32” 4k UHD one.
Having one has definitely helped me focus better. Left side of the screen is the browser and the right is VSCode with a terminal in the bottom half. It’s my ideal setup as of last 5 years.
I’m about to plug back in my third. I keep losing windows, and I think if I’m a little more careful I can keep from stacking too much on three monitors.
I use a single curved 32" monitor, same setup as above most of the time via window snapping: code/result (UI, test suite, etc)
It's my favorite way to work so far.
The conclusion in this article seems pretty silly tbh... I'm able to use my large monitor to test multiple browsers and resolutions at once with instant feedback, leading to better responsive designs, delivered faster.
Single 32" works best for me, too. All other things equal, I'd consider curved an advantage, but it doesn't matter that much for 16:9 or 16:10. If you decide to go UltraWide instead though, I very strongly recommend getting a curved display. I couldn't make 34" UW work for me though -- if I use two things side by side, I need to keep my head sideways, and if I center something, there's not enough space on the sides for more stuff.
As for software, what I end up using the most is Unity, Unreal, and Visual Studio. I just wanna say I absolutely hate all 3 of them.
Having one has definitely helped me focus better. Left side of the screen is the browser and the right is VSCode with a terminal in the bottom half. It’s my ideal setup as of last 5 years.