… if you know how to use virtual desktops and shortcuts. You can’t look at two screens at a time, anyways.
One use case I can understand is having a 2nd monitor for checking stock prices or checking for a certain event. Other than that, I don’t see how it contributes to “productivity” while working or coding for example.
P.S: Tiling WM users may understand this post more
It comes down to preference in the end.
I’m just the kinda guy who likes having everything spread out. I have two monitors at my desk, great for anything that benefits from having a reference nearby, such as having a wiki open for a game or splitting two code windows on one monitor and having the web page up on the other.