This is NOT an answer, but just a perspective from another place:
I am in western Canada, in the province of Alberta.
I would not presume to cross fenced land without asking. But unfenced land is considered open. Much of the land near streams is crown land -- and that is open for reasonable use either walking or camping. Many provincial parks are open year round and allow either car camping or tenting with minimal fees. I often camped at Two O'Clock Creek campground on the shores of Abraham Lake on my way from Edmonton to Lake Louise ski resort. In winter I was the sole occupant to the camp.
We have large parks, both national and provincial, that is open for camping or hiking. Heavily used areas have permits and quotas to prevent overcrowding. In addition all of the provincial forest lands are open for camping and hunting without permit. (Some common sense applies: Don't camp in active forestry sites.)
The Navigation Act allows camping within 12 meters of mean high water on all navigable streams for any party that is traveling along the stream.
Some years ago I did a 3 week canoe trip from Forrest Lake on the upper reaches of the Clearwater River in Saskatchewan, down the Clearwater, up the Mirror, then down the MacFarlane finishing at Fort Smith. During that time we saw 1 other party, a motor boat across about 3 miles of water on Lake Athabasca.
On other trips, not only were we the only people present, but despite diligent research we were unable to locate records of anyone having done the route since the Canadian Geological Survey traveled them 50 to 100 years before. In a few cases, I have made a plausible case that no one had gazed on a particular vista since the ice left 10,000 years ago.
Population densities in Canada are low: We have 35 million people on 10 million square km. Most of the people live within 150 km of the US border. Compared to Europe, I think that a greater fraction of people live in cities rather than villages and smaller towns.
If you look at a map of Canada you will see a chain of large lakes running from the Great Lakes to the northwest to Great Bear Lake. North of this line is the Precambrian Shield -- a mass of ancient granite. This entire area, some 2/3 of the country, is unsuited for agriculture or forestry, and makes for difficult road building. (Rocks and swamp) Mining is significant, as is tourism.
So yes, we have very large quantities of not very much, and (so far) don't need these rules.