I am also of the opinion of needing only one monitor because I can only focus on one thing at once. Whatever is not the work I am doing when I focus, goes into

I am also of the opinion of needing only one monitor because I can only focus on one thing at once. Whatever is not the work I am doing when I focus, goes into another desktop space. I am also a power user of an OSX window manager called Spectacle. The tools and practices that help me focus are key.