Terence's picture of meditation is pretty superficial (in the above clip, in particular); it is not fair to compare what he is presenting as a view of 'meditation' as deep meditation.

Meditation on par with psychedelic drug use would be more akin to vipassana-style meditation.

A large part of Shamanism that occurs between entheogenic ritual is intentional "melding" of states. Shamans are instructed to try to harmonize their senses, see their smells, taste their vision.