Back during Windows XP days I had triple CRT monitor at home but that was kinda over the top. I would have a game on one screen, and leave game guides/status monitors/IM or chat rooms on the others. I sorta did it because I could -I was learning about PCs and found enough hardware from junk computers to drive all the monitors without driver conflicts.
During the 7 days, some crappy work PCs became valuable tools with SSDs and video cards. Daily I would want to figure things out about a client's phone call in real time and the monitors allowed me to go MUCH faster expanding my view of information instead of juggling it on the taskbar. Also for planning logistics -timetables, maps, lists. If I only had one monitor, I'd have died.
Today I just have one wide monitor at my desk at home. But I am also surrounded with other screens like tablet, phone, TV, Switch. I have a bunch of extra monitors, it's just unnecessary for me now.