Do you know about promises, do you use them or not, why?

So I was wandering around the forum and came across this post: Promises and Why You Should Use Them. It sounds pretty complicated stuff to me, and I have no idea if it’s really worth learning. It also seems like very few people are actually using it, I get that impression.

I would like to know your experience with promises and what you think about it. mainly things that would help me make a decision on whether to learn it or not.