I become a sad sad camper whenever I have to hit the road with my 13" UHD laptop. I have to use my bifocals just to see what's on the screen (and chicklets keyboards suck once you're used to Cherry MX Blues, not to mention that trackpads are the devil's own handicraft).
At home (my office) I have dual 22 inch monitors (some day, I will upgrade to bigger ones, but I just upgraded to a new NUC so there goes my budget) and use a 2x2 workspace grid, ie. 4 virtual desktops each with two displays.
One desktop has IRC and email (I work remotely with several teams, this is the main communications console). Between all that it fills both monitors.
One desktop with a fullscreen browser on each display, often used with a hangout on one side and a collaborative doc on the other.
One desktop with multiple shell and vim windows open, no tabs just one window per source file or task, because that's how I roll. This is the development environment.
One desktop for miscellaneous stuff, like say a Dwarf Fortress session (plus tools) or maybe a second development environment depending on what I'm multitasking at today.
The advantage of multiple monitors over one big one is that they're at an angle to each other, as if I have one long curved monitor. That puts them more into a single focal plane. Also, they're not too high, so I can see out the window behind them still. One long curved monitor is also out of my price range.