I need to have my number pad on the left side of my keyboard, despite being right handed.
This is primarily because I use Blender a lot, and being able to use the mouse at the same time as I change camera angles is so useful.
And then there's the fact that I use my left hand as a calculator while writing with my right for homework so it's in my muscle memory.
Same here, I have 3 monitors, the one in the middle being ultrawide, and I still don't feel like I have enough monitors.
People don't understand that you need a monitor for everything - "this is ultrawide for multitasking, single player gaming and watching films" and "this needs to be portrait for reading code more efficiently" etc etc.
I think I'll be happy with 5 or 6 monitors though, any more than that would be excessive for even me.