No, that isn't it. Have you been to say the US or Australia (both very low density)? "Private property NO TRESPASSING" signs everywhere. Very few official trails. If you want to walk from A to B you better have one of those trails or you find yourself walking next to a road (without sidewalk).

Compared to here (high population density, Germany) or say the Alps, where you can use any road used for forestry or farming. The only thing you can't access is small gardens in relatively high density villages.