Actually, i hate "watching like a hawk". I hate looking and feeling needy, demanding and opportunist. I feel uncomfortable when speculatively seeking eye-contact even though I know it's what the game requires. Another reason why I prefer a direct approach.
Me too.
I have tried to develop a reputation for dancing with anyone who asks unless I am at a point of refusing
everyone. Theoretically that should take some of the risk out of approaching me. I try to approach newbies myself since they won't know that.
I've also found that since it is a small community where almost everyone knows everyone else, that there is a lot of eye contact and nodding going on
as a greeting when folks first notice someone they know who they haven't said hello to yet. That tends to confuse any use of cabeceo.
The alternative becomes very awkward:
You arrive at the milonga. Someone you know and are friendly with is dancing. At some point after they leave the dance floor, they see you have arrived and they "say hello" from across the room. You don't want to dance with them at that moment (or at all) for whatever reason, so you either avoid eye contact (and therefore any friendly greeting) or you look away quickly when eye contact occurs, which
in context, is fairly rude. You could smile and give a little wave then look away, but that becomes a rather mixed signal.
I don't live in Buenos Aires. I live in a mid-sized US city. People tend to arrive and greet at a milonga in a similar fashion to any other social occasion or venue, because that is the cultural pattern of
Americans.
They non-verbally acknowledge (greet) people they know whether directly in front of them or across the room.
This acknowledgment as a greeting is not sufficiently different from cabeceo. It's farily easy if you are doing it as you first arrive (taking off a coat, changing shoes, etc). Then other people realize it is meant to be "hello" and not "I'm ready to dance with you" (since you are obviously NOT ready to dance.. although I've had leaders come over and wait while I get ready).
But it gets tricky when you are out of your coat and into your shoes before someone ever realized you had come in, or if all that "gettin' ready" takes place in a lobby. As the evening progresses, it starts to sort itself out. But it can be a couple of tandas before all the greeting smiles and nods are over for any one individual.