A lot of the posts here seem to hover around an idea, and it is a complicated idea: what is nature? What is wilderness? And obviously there is not a single definition to those things. e I
This has been a contentious issue for me in the past, because I grew up in the Pacific Northwest, and have lived in the Rocky Mountains, so most of my life I have been around natural areas, and have at least had access to wilderness areas. And this has caused disagreements in the past because the type of natural and wilderness area here are a step beyond what is possible in say, the Eastern half of the US or most of Western Europe. I mean, there are a few exceptions, like the north of Maine, but in general, what it means to be in a natural or wilderness area is quite different for me. And sometimes I sound like I am bragging, which I guess I am, but it also is a real difference.
For me, “wilderness area” means there are no human structures or roads. From a naturalist perspective, this means a couple of things: usually an absence of invasive plants that grow on disturbed ground, such as along roads. It also means the presence of mammals and birds that are shy around people. And also the presence of climax forests and apex predators. Elements of those things can be possible without a wilderness area (puma and bear can enjoy being around people), but there is nothing quite like an unbroken forest.
So that is the context for how I view the question. I live in a city in Oregon right now, and basically with a short bicycle ride, I can get into “soft” natural areas, as in areas with few people and no structures, but they are still places with roads. They are still fragmented enough and close enough to population centers that even if I can see megafauna (mule deer), it isn’t a wilderness. But when I was in Montana, there were literally places 4 or 5 miles from my home where I could reach a trailhead where it would be 30 or 40 miles of forest before I hit a forest service road. And I would say those areas never disappointed me!
So that is the first answer to the question.