You know you hear a lot of "I don't think 3 screens would be better" what you never hear, however, is someone with three screens saying that a single screen is better
Bottom line, once you go three screens you will never, ever go back to single screen. It is so much better words don't even come close to describing it.
I have three 23" Dell monitors with the sides arranged at 45 degrees. I sit 24" from the middle screen and the two side monitors are very close to filling my peripheral vision.