There is much truth in what you write. I got involved in this crowd back in the 1970s after reading Gerard K. O'Neill's The High Frontier: Human Colonies in Space. It was a thought provoking, impressive book. My involvement, though, was moderate and independent. While, at the beginning of my interest, I wanted to get to L5 by 95, I eventually realized that it would not be L5 by 1995 but more like L5 by 2495. O'Neill made significant proposals that appealed to me. Instead of adventure trips to the Moon or Mars, he -- and others -- proposed doing things like building space based solar power satellites to benefit humans on Earth. They are still in the future, but could come about in the future. There are many problems to solve, though.
Sending people to Mars? Let's see. Mars does not have a geomagnetic sphere to protect it from solar outbursts. People will die if they are on the surface when one of those things happens Martian atmosphere is very thin. At ground level atmospheric pressure is only 1% of Earth. That is not nearly enough. Martian gravity is less than half of Earth's. Is that enough? We shall have to experiment.
There is one place on Earth that explorers have explored since we have had written records -- Antarctica. It wasn't even discovered until 1820. The first expedition to Antarctica was the Scott expedition a century ago. We started building bases there after World War 2. Quite a few humans have now lived there -- at least for a short time. Same gravity, same atmosphere, same geomagnetic sphere. Just much colder.
The optimist in me thinks we humans will, eventually, live and work in places other than Earth. It is going to take a good bit of learning, though.
Enough for now.