Being alone and hiking and camping in the wilderness without human contact for longer period can be amazing experience. There can be initial anxiety and intense desire to go back after romance goes away and your internal shit comes to light. When there is constant need for do chores to survive but also free time and no human contact, no books, radio or music, mind gradually settles into itself.
It's like coming from bright light into a dark room. Gradually your eyes adjust and you start to see more. Coming back into the civilization is similar to someone pointing flashlight into your eyes. So much external triggers for behaviour. Realizing that I'm not actually me with other people and I'm disappearing into network of others. Me with others is mainly just bunch of triggers that fire based on conditioning.
If I can feel intense otherworldliness from just week or month alone, I imagine that if someone spends decades alone, civilization might seem like miserable alien ant colony. Everybody is responding to commands from others and carrying stuff they don't care about.
ps. It also can trigger psycosis, panic or some kind of madness (prairie fever, cabin fever) in some people. Romanticizing it as escape from all your problems might give people the wrong idea.