In person, I use my hands, facial expressions, change the tone/pitch/volume of my voice, body posture, point at things, throw things, whatever is needed to communicate a point.
This is my default in many ways, but also a benefit to me in my profession. Alot of times I have to facilitate meetings where a big room of people have been ordered to show up and solve some ridiculous problem in a short amount of time. So, the best thing for me to do is get them all in a good mood, elicit the information needed to do the work in the course of entertaining them, and then send them on their merry way as I draft up what is needed to complete the work. Such work is among my favorite things to do for a living.
When it comes to being an appreciator of body language as used by others, I guess I am if I appreciate something about the person wielding it. If someone is annoying to me or dislikable to me for whatever reason then I am not easily going to be endeared to something as specific as their body language. But, when it comes to casual observance of the interactions of total strangers with each other, this is really entertaining stuff to watch.
So, yeah, I'm a fan I guess.