Like Oomis said, most of the men dance. The mechitza doesn’t stop those who want to look. They will look no matter what.
Do you think Tu B’av dancing was wrong? That wasn’t a shidduch system.
There is nothing wrong with meeting your spouse on your own in a kosher outlet. Meeting at a bar is usually problematic. Meeting at a wedding can add another level of simcha to the simcha. Please find me a halachic basis for saying that meeting someone at a wedding is wrong.