I work on two large monitors plugged into each computer so there is a lot of desktop. I use the mouse roller button to open things in a new tab all of the time, and often have several browsers open at once. Even working on a single screen setup I never have my browser open to the outer edges, I can always see part of the desktop behind and move things around as I work. If I browse over anything on a screen and want to look closer I right click with the mouse and choose "open in new tab." Done.
What possible benefit is there of this apparent new way to open a second tab?