Picture this: a groovy West Coast Swing or Hustle song comes on, and people get up to dance. They all line up in neat slots and everybody gets to dance without worrying about collisions.
Now picture this: a WCS or Hustle comes on and couples take the floor with absolutely no attention to their orientation. Couples are at right angles to each other, dancing across each other's space; or dancing the figures in circles, instead of slots; or dancing traveling actions from samba or foxtrot that cut right through the middle of the dance floor.
Which room would you rather be in?
Hustle and West Coast Swing, contrary to some opinions!, do actually have figures that leaders and followers can learn. And when you learn the figures, you learn that the dances are intentionally laid out to keep the leader either trading places with his follower, or staying more or less in place, sending the follower back and forth across his position, on a slot.
What is a slot? It's a rectangular space on the dance floor, about the size of a doorway, defined by leader and follower at arms' length from each other. Leader and follower hold their position during these dances; they don't travel around the floor - OR, if they decide to travel, they do it by moving to the outside lane of the dance floor.
This is the truth: WCS, properly danced, is danced in a slot. If you go to a WCS competition, you will not see dancers crossing each other; you'll see them lined up so that the judges can see everybody at all times.
Legend has it that hustle and WCS evolved, or were designed, to work on a slot to maximize the number of dancers on the floor or to show both partners to movie cameras. Either story could be true. The origin of the figures isn't all that important, though. What's important is that you can use knowledge of the figures to maximize your enjoyment of the dances - AND to raise the overall quality of dancing in your community.
The simplest way to start is to take a look at the room you're dancing in. Most likely, it has a "front" and that "front" will be a long side of the room. At Ballroom by the Bay, and at the CCVMA where USA Dance Los Angeles has most of its events, there's a stage at one side and seating on the other. The "front" is where the seats are; and, not coincidentally, it's a long side of the room. You want to be lined up parallel to a long side.
A thoughtful leader with good skills will position himself so that he and his partner dance with their sides to the "front." That way, those seated can see both dancers throughout. A leader with maybe not-so-good skills will position himself facing the front, so that his partner can only be seen from the back, except when he changes places with her - in which case, those seated get to see his back!
East Coast Swing is circular (as is the social version of Jive), West Coast Swing is not. Lindy Hop is a whole other critter, and honestly you don't see much of it at ballroom dances; followers can't do it safely in ballroom shoes, and lindy hoppers do tend to want to do the throws and aerials that are way too dangerous for a social ballroom environment. For what it's worth, though, Lindy Hop has both circular and slot figures. And the slot figures were adapted to become WCS.
Hustle draws on figures from samba, and some of them do travel. There are elements of tango, merengue, cha-cha, even foxtrot in modern hustle. The classic figures stay in the slot. If you want to use adapted figures to travel, get on the outside lane. It is not okay to weave through the center of the floor.
It's also not okay to throw your arms around. People tend to love hustle and WCS because they really get to stretch out. Unfortunately, sometimes they forget there are other people on the floor.
As with every other dance, your dance space is defined by your connection with your partner. Any arm stylings, kicks, or other extensions of your limbs need to be confined within the space you share with your partner. Never kick backward and never throw an arm behind yourself. These are stylings you may have seen in a performance and thought, "hey, cool!" but the key word there is PERFORMANCE.
If you have not had a real class in WCS or Hustle, you may not know how to orient yourself and work the figures within a slot. Find yourself a teacher (Russell Adcock and Jamie Bayard are local experts) and learn how to do it right. The quality of your dancing will instantly improve - figures are designed to work best when specific techniques are followed. And bringing your better technique to the dance floor makes the evening more pleasant for everyone.