Dense communication

A friend told me that my communication is unusually dense, by which she appeared to mean that I actually expect what I say to be listened to, I'm not just babbling to hear the sound of my voice. Which is true. The odd thing is that she said she doesn't have that "problem" with other people she talks with.

Now I'm curious. What are your expectations around being heard when you're talking one-on-one with someone? What are your expectations when listening to someone speak?