It's great to "go with it". Leanne Payne, for example, reinforces the idea that the "heart" is underappreciated in its ability to understand things beyond logic and analyzable facts (cf. The Broken Image). I think it's also fun to think about the ways our subconscious can receive information.
I believe that vibes are a part of INJ communication, for example. They do this through the eyes. But everything about a person's subtlest movements produce vibes. Just think of the subtlety of noticing a person's breathing patterns, for example, as a vibe. A face slightly lower than "usual". The vibes communicate that there's something not right, but you might not be able to identity what that thing is.... or that something is very different about someone today, etc.
E.g., I sense sometimes that I am feeling much different in some aspect of myself even up to the recent past--as if I have achieved some nebulous milestone in life. But I can't pinpoint what it is exactly, just some new sense of maturity in some aspect of my humanness, ability to communicate with others, etc.
You're right all of those subtleties are communicating all kinds of things, and how in tune we are to them can tell us a lot. Very good point. "Nebulous milestone", that's a great phrase - I love that. That sounds better to me than older, wiser, or all the other words we use to describe growth. I have reached yet another nebulous milestone