The way we use the term ego around here is a little different from the traditional Freudian definition of ego in the Id/Ego/Superego complex as it's generally understood.
In our usage we tend to refer to ego as the sense of self, the thinker, the I-dentity.
In the traditional Freudian context, ego is not really this stable, self-reflecting entity so much as a kind of process that attempts to balance desire (Id) against morality (Superego).
Both the id and superego would fall into what Jung terms the personal unconscious. Whereas, I would contend that the way the tryptamine spaces manifest themselves seems much more like tapping into the collective unconscious. Of course, this is just my own speculation based on my personal experiences and others may find their experiences manifest scenarios and imagery that are easier to trace back to specific memories, thoughts, ideas and events.
Or perhaps, and more likely, it's some kind of complex interplay of both the personal and the collective with personally meaningful symbolism manifesting alongside universal archetypes.
Interesting topic of conversation, thanks for bringing it up!
I look forward to hearing other peoples thoughts on this idea.