Not everyone has a laptop with a 19 inch monitor. Or a 24 inch desktop monitor at home. Some folks may have a netbook or Chromeb0ok with a 10 inch screen, or maybe an old laptop with a 15 inch monitor.
With screen real estate at a premium, you have to figure a way to maximize your space. So here is a good article that may give you some tips you had not thought of in your struggle to win the monitor real estate war.