I went from three screens to one of those new 34" curved Dell monitors and it's been a big productivity boost for me. Part of the story is that I was never full

I went from three screens to one of those new 34" curved Dell monitors and it's been a big productivity boost for me. Part of the story is that I was never fully comfortable with either xmonad or gnome-shell on multiple screens. The other part of the story is that it's easy to wind up focusing on the wrong screen, at least for me. The 34" + xmonad combo with a asymmetric three column format helps me have two large focus windows and a series of shells off to the side, without having the distraction of slack always being visible. As an added benefit, notifications which used to appear on every screen now only appear way, way at the corner of my vision. For me, at least, this is great because I don't notice them if I'm busy concentrating, but if I'm looking at, say, documentation (my rightmost column), the notifications are prominent enough that I can look down and see what I'm missing in another workspace.