Re: You get used to it.
I've been on the same journey, these days I have a Iiyama 40" 4K primary, and a cheap Acer 28" 4K secondary, rotated to portrait orientation. The secondary display gets terminals, chat, logs, and whatever I'm currently targeting (browsers, VM's, emulators) leaving the primary free for acres of lovely (and unlovely) code. A 40" screen, while not being quite as cool as 3 monitors, is very nice for games too and requires no fiddling to get it to work.