Well plenty of people realize that without psychidelics. What you described is just our modern standard scientific understanding of how matter, space etc. work.

This definition from Timothy Leary is better, albeit a bit hard to understand:

Ego loss is complete transcendence − beyond words, beyond space−time, beyond self. There are no visions, no sense of self, no thoughts. There are only pure awareness and ecstatic freedom from all game (and biological) involvements. ["Games" are behavioral sequences defined by roles, rules, rituals, goals, strategies, values, language, characteristic space−time locations and characteristic patterns of movement. Any behavior not having these nine features is non− game: this includes physiological reflexes, spontaneous play, and transcendent awareness.

Or another definition:

Ego death is the cessation, in the intense mystic altered state, of the sense and feeling of being a control-wielding agent moving through time and space. The sensation of wielding control is replaced by the experience of being helplessly, powerlessly embedded in spacetime as purely a product of spacetime, with control-thoughts being perceptibly inserted or set into the stream of thought by a hidden, uncontrollable source.

So your definiton is correct, but an understatement in my opinion. It's more intense than that but I understand that it's hard to put in words.