Lots of people I know or have talked to apply some sort of revelatory capability to hallucinogens. Personally, I have a bit of a hard time taking this sort of thing at face value - unless said person has been able to use some other means (like sober meditation) to verify the experience.
I had a conversation-with-myself experience once not unlike the nature of that the OP had, though it wasn't a positive one. It was more of a paranoid, multiple personalities situation where I was discussing with myself having to "hide it" (your guess as to what "it" was is as good as mine) from my my friend whose bed I was rolling around on going nuts while he was watching Princess Mononoke. During the whole escapade I was talking to myself and was able to "see" from both my point of view (as the person who was talking to myself, "seeing" from both selves points of view) while also seeing from a bird's eye view, so to speak. Certainly eye-opening as far as perspective is concerned, but I'm still skeptical as to the revelatory nature of such experiences.
Part of the reason I find such experiences to be positive and growth-oriented is because of the opportunity to reevaluate and redefine our perspective on pretty much anything.
Another, very positive experience I had involved - amongst other things - myself simply thinking about the fact I was thinking. This created a sort of infinite loop, if you will, in which I was thinking, then viewing myself (from behind my eyes, if you take my meaning) thinking, then viewing myself viewing myself thinking ad infinitum (lasted for a bit, but not sure how long for obvious reasons).
This second experience I was able to "verify" with meditation while using a mantra (over a year later, my system was completely clean). In the overall best meditative experience I've ever had I was able to slip into a state I had and have since glimpsed quite a bit - a sort of compression of perspective and time. During this meditation, which was basically just a good, relaxed time at first, I had a few moments of seeing my life as a single picture - metaphorically speaking - without the limits of time and my personal perspective.
In conclusion (hoping this post has been at least somewhat useful), I personally just worry about the possibility for random gunk that hallucinogens (with or without meditation at the time) bring about - no doubt anyone who has used them has experienced some "crazy shit" of some sort, though it sounds like the white/black differentiation in your experience is an excellent realization and I'm glad you shared it.