There are a lot of other ways to broaden one's horizons that don't cost tens of thousands of dollars. Or that do, but broaden the horizons in other ways.
This seems like more of a problem with our system of financing college than with the idea of college itself. Plenty of places manage to make college education more affordable than in the US.
They are worthless from a cost-benefit analysis. You could join a social club for free and broaden your horizons in ways that would be vastly better for your career.