When I am working I only use one screen, and only one window in the screen, and instead I constantly switch between virtual desktops, to the point where I just think "browser", "editor", "terminal" without even perceiving the keystrokes.
However, for gaming I dream of having one of these ultrawide screens that have the resolution of 3 normal screens side by side. Something quite complicated to have in a laptop, but I have seen some attempts.