It makes a huge difference in my experience. I use a 30" most of the time with side-by side, but occasionally use one (sometimes two) of my side monitors (20" i

It makes a huge difference in my experience. I use a 30" most of the time with side-by side, but occasionally use one (sometimes two) of my side monitors (20" in portrait) if the need arises. It is rare for me to use more than just the 30", but if you think about what you'd like to be visible it could be as much as; code, browser, specs/reqs sheet and api/library documentation. I am getting a laptop for coding soon and plan to get an external USB display to complement it for this reason. To the OP; just try using two displays for a couple of hours. You'll never go back.