So the retina display of a model has twice the resolution of whatever display its replacing. So a 1440x900 goes to 2880x1800. If I understand correctly, even though you have twice the resolution, you still have the same screen real estate, or perhaps to put it better, programs use the extra pixels to make the display crisper, so you don't appear to have more real estate
What I am getting at is, is it possible for a 2800x1800 display to use the extra pixels to allow you to show more, so I could use programs like I do on my current 17"
What I am getting at is, is it possible for a 2800x1800 display to use the extra pixels to allow you to show more, so I could use programs like I do on my current 17"