The central part of a trip is it's uniqueness to each person. Trips (and drugs as a whole, really), open your consciousness to the truth of reality, but instead of operating as a transport from A to B, it's more like firing a cannonball onto a checkered field (from point A to any random point between B-Z). Imagine this on the scale of the infinite, and and the chance that everyone experiences the same trip is equal to the chance of everyone experiencing a different trip (infinity as a concept does weird mathematical things). So, finding similar experiences of full-on trips can often be difficult, and sometimes impossible. I am a firm believer, however, that each trip shows some truth of existence. One, or multiple, slivers of the infinite. Mathematically and physically speaking, the concept of infinity itself produces a logic loop that both justifies and invalidates every outcome at once (hence the infinity symbol's ebdless feedback loop). This is a really hard concept to explain, but it's sort of like everything is correct, incorrect, both, and neither simultaneously, but also individually. So whatever you experienced, in my opinion, is some part of that cosmic puzzle as a whole, and the existence of infinity implies that all things possess the capacity to be...all things. Nothing is incorrect, and everything is everything, so to speak. Moving on:
I haven't myself FELT the atomic structure of things, but have often SEEN it when tripping acid. And as for the black hole density in relation to the empty(ish) space between molecules, I don't quite understand what you mean, but I'll try my hand. Black holes have such intense density, because they are essentially the physical result of the mathematical concept of an asymptote or hole. As "x" approaches the position of the discontinuity, a limit is (typically) established, and the function digresses infinitely, always approaching, but never reaching the discontinuity (though sometimes "jump" the whole of asymptote and continue. In the physical model of a black hole, this infinite digression into the event horizon (which as far as we know, is in space was a hole is in calculus), produces ridiculous density. The space between molecules thing is too ambiguous and I don't quite know how you mean there, but this exact concept of limits and infinite digression is present everywhere, so I would be entirely unsurprised if it was extant in the way you mean. For example, if a ball bounces half of it's height with each bounce, mathematically, it should never stop bouncing, but digress infinitely into unfathomably miniscule numbers. Zeno's paradoxes are similar perfect illustrations of infinite digression/limits in this context.
I hope that was decent enough a contribution lol. I write a lot and tend to get ridiculously absorbed into whatever I'm spitting out, so things get scattered somewhat frequently, so if that was useless, let me know haha