Amen Mad_Mat.  The Boundary Waters seems to have more of a problem, what with the designated campsites only rule.  The only time it's been a problem was when we were camped on Bootleg Lake with another group claiming the only other campsite within miles.  Unfortunately a 3rd group came through at about 6pm.  They never stopped by, but we would have gladly shared our site.  I believe they brush crashed at the portage that night and left in a hurry that morning.