Around here, the music is played in tandas in that there will be three songs that go together, then another set of three, and so on, but no cortinas. People follow the three-dance rule, but will pick up a partner in the middle of the so-called tanda and dance for three, including when the music switches. They are not as crowded as the milongas, but the space isn't any bigger.
Frankly, I don't believe people in America should follow what is done in BsAs just because we do the same dance they do. We're a different country with our own culture. Certain social niceties should be observed everywhere, of course, but if it's the norm to change your shoes at the table because there's nowhere more appropriate, and that is what everyone does and expects, I see no problem. In ballroom and swing, that's what everyone does, as well.
Just like every other area of life, if you go somewhere different, you should try to figure out the norms and fit in. I got to a milonga early a couple weeks ago, and a man was waiting outside who had arrived even earlier. We introduced ourselves, and he was from the bay area, so he asked some questions about our norms, like use of cabaceo, etc. I answered, and he had a great night.