Plowing, planting, fertilizer and picking can be done within inches. A farmer can now plan on the contours of the land and the tractor can steer. This allows for higher yields and better land usage.

Not to say that plowing, etc isn't exciting work, but with the tractor doing most of the work, you can rock out to tunes in your AC environment. When they install the GPS steering, there is a free minifridge. :-)