I think the statement that "You'll enjoy the music a lot more by adding the physical movement to it" is unlikely to apply to everyone, and may not even apply to a majority of people. Not because humans don't have a natural inclination to "move to the beat" (they might), but because a dance club may be much more intimidating for many people than, say, a music circle.
I have both legs, I love music (our home has several musical instruments), and I'd never join a dance club. Glad it works for you but I just wanted to offer another perspective.
Also, nitpicking, but you can dance even with just one leg, as the first (or one of the very first) verses in "Moving to Florida" by the Butthole Surfers shows ;)
Depends on which ones you go to. If you go to one where the crowd are people who have taken lessons, yes, you do see the stuff in the picture. If you take lessons, yes you can dance like that. There's always a shortage of men at these functions, so if you make the effort to learn it, you can dance with excellent partners, and your rear will never touch a chair.
The costumes in the pictures you'll only see at a competition event, but people still dress up for the club dances.
The community of these people is not large, and they know each other, and will network to find a venue to meet up at.
It's really too bad more people don't do it. The barrier of learning it is rather high, as there's a long awkward stage, and few are willing to put in the effort. But the payoff is lifelong, and as I wrote, it really dials up the pleasure from music.
