I like it... But have to be quick smart about application of it. most followers also like it very much if I as the leader chat them up on the floor.. But some don't and have to be quick to know when to hold em and when to keep quiet. Doesn't work for everybody.
Yes, but you can talk close to your partner's ear. And some people have loud voices. Also, I'm referring to conversations between songs in a tanda, not while the music is playing and you're dancing. I don't talk while dancing and don't like it when others talk while dancing.
Personally, I try to avoid verbal communication from when I cabeceo until the end of the tanda. Of course, if someone asks me for my name, where I'm from, or says "thank you" then I will reply to them. I just find it very annoying when people stand and talk on the dance floor in-between songs or during the cortina, especially those who do it for a prolonged amount of time.
I do engage in conversation off the dance floor, just hate it on the dance floor.
I guess it depends on the local customs of where the Milonga takes place. For example in Buenos Aires for the first 30 to 40 second of the second or third piece of the tanda, people stand and chat. Only the uninformed tourist dance. It may be different in the US, where people don't pause their dancing.