I'm using a 43" 16:9 4k monitor. It's the most screen real estate you can put in front of you without having to move your head.
I would love to see more 16:10 or even 3:2 monitors in bigger sizes (Huawei has started shipping a 32" 3:2 monitor recently, but they seem to be the only ones interested in that market).
The 43" monitor is too big for any single application, so I'm using xrandr to split it into two 4:3 displays at the top for development/browser/chat, and three terminals side-by-side at the bottom.
Also using a 43" 16:9 4k monitor. I find that it's larger than I ever actually need, and something a bit larger than 28" 4k would be ideal. In particular the additional height is useful. I can get the monitor to do PinP or PbyP but tend to use a specific resolution/refresh rate that uses the middle area with a huge matte around it--I like how that eliminates visual distractions from view when working.
4k 39" 16:9 here, but it's a TV not a monitor. I'd also love more height, but I think we're stuck with 16:9's past 35" since monitors past this size aren't popular. While we're wishing, I'd also like curved please :)
Usually my main window is an IDE and it takes 50% of the center, and I'll have miscellaneous windows off to the left and right peeking out from behind it. Creating shortcuts to specific programs (also to minimize/maximize/close them) is also helpful as mousing to the taskbar is just not efficient.
My current setting is 3 screens, the laptop in front, a 1200x1980 vertical to the left for terminal work and a 1200x1920 to the right for IDE work. I can still use the peripheral vision to see if something happened in the terminal without turning my neck and, with the clever use of colours and wide characters (Apple’s Terminal app passes the VT100 torture test), I can even know what happened.
Some programs don't support this xrandr feature very well. (The problem is that they show popup-menus on the wrong submonitor if they were opened _after_ splitting the screen). My workaround is to start all programs before splitting the screen, and all menus etc seem to work properly then.
I would love to see more 16:10 or even 3:2 monitors in bigger sizes (Huawei has started shipping a 32" 3:2 monitor recently, but they seem to be the only ones interested in that market).
The 43" monitor is too big for any single application, so I'm using xrandr to split it into two 4:3 displays at the top for development/browser/chat, and three terminals side-by-side at the bottom.