I use three monitors for my multimedia development work, and I can't imagine using fewer. I would get a fourth one if I could.
#1: My main 4k monitor, where I do the bulk of my work. I need the whole screen for this.
#2: My second 4k monitor, which I use for looking through documentation, taking notes, and working with the file system. (I have it split into quarters using PowerToys, but it's still very busy with many overlapping windows that I have to flip between frequently, which is why I wish I had a fourth monitor.)
#3: My old Cintiq, which I use when I need to hand draw something. In the meantime, it is dedicated to monitoring communication with colleagues (it's too low res for much else).
#1: My main 4k monitor, where I do the bulk of my work. I need the whole screen for this.
#2: My second 4k monitor, which I use for looking through documentation, taking notes, and working with the file system. (I have it split into quarters using PowerToys, but it's still very busy with many overlapping windows that I have to flip between frequently, which is why I wish I had a fourth monitor.)
#3: My old Cintiq, which I use when I need to hand draw something. In the meantime, it is dedicated to monitoring communication with colleagues (it's too low res for much else).