My experience with ketamine treatment for TRD is that it was lots of awesome shapes and colors and sense of melting into the floor, but definitely no communion with "god" or "mystics", no special reexamination of the self or amazing new perspective. Despite that, I still experienced some improvement in symptoms.
I would hope that pharmaceutical research can reduce the time and expense related to this treatment and the side effects like nausea, and less on the moral panic that some people use these drugs for fun somehow.