In The Face of Battle, John Keegan noted how the environment of combat changed over the course of history. One way it changed in America during the eighteenth and nineteenth centuries is immediately apparent—battles got a whole lot bigger.
If you had four and a half hours to lead a tour of a major Civil War battlefield, what would you highlight? You’d never have this problem with a Rev War battlefield, at least not a Southern Campaign site. You could probably lead three back-to-back-to-back tours of King’s Mountain or Cowpens in four and a half hours.
Take a look at King’s Mountain, Cowpens, and Gettysburg on Google Maps, all at the same zoom level. The Cowpens field would likely fit between the Round Tops and Emmitsburg Road, and I think you’d still have room for King’s Mountain.
Numbers engaged illustrate the difference, too. Greene had something like 4,500 men at Guilford Courthouse; the Confederates fielded ten times that many at Shiloh. Washington had over 14,000 at Brandywine, which sounds like a lot until you consider that the Union suffered over 12,000 casualties at Antietam.