When I was college age, the place I lived in country western line dancing was very popular. There were about 3 or 4 common line dances. Also two relatively easy couple's dances, the two-step and the waltz. I actually learned to do them all, though I was bad at it and got out of step a bit more often than most people, nobody cared. During that time in my life I was sort of obsessed with socializing and observing people and trying to be "normal." I really hated the smoke, noise, and crowds so the dance phase didn't last long!
These days, maybe once a year I end up someplace with techno dance music and people are doing the free form thing. Even if I 'm drunk, I'm too self-conscious to do it, though I can see how it might be fun. I just enjoy watching them and listening to the music. Thankfully I never get pressured to, because my husband has never danced and won't try it. 