As much as I think we should invest in colonizing other planets, I don't think it is far to say that we slowed down or stagnated our progress into space because more humans haven't gone farther than the station. There was no great scientific accomplishment in putting a man on the moon, it was a great feat of engineering, great for politics, and (probably) great for the economy, but there was no progress made that a robot could not have done for a fraction of the resources.

The iconic vision of moon project is the American flag. If that doesn't suggest that it was more about politics that progress, I do not know what will.

On the other hand, today were are focusing our space exploration resources as efficiently as we can, sending small rovers to do research, cooperating internationally instead of duplicating effort, ETC.

Once we learn enough to make a long-term colony feasible (or run into some barrier that requires human presence to solve), it is simply a waste of resources.

Besides, we have a continues human presence in space, I consider that far more impressive than a couple of visits to the moon, or Mars.