Hi Chaz 
Before the DMT tests I had the same thoughts as you. After the experiences they changed to some degree. The DMT in ayahuasca plants mostly contain nn-DMT and only in traces or none of the 5meo-DMT which has been naturally found in the body and brain of a human. The visual opening is very unnatural in my experience, unlike when it opens naturally like with fasting these days =P
And shrooms also contain 4-PO-DMT and 4-OH-DMT, so they are of the same family aswell. To my experience nn and 4-OH share a lot of characteristics, nn covering more subtle and visual openings. Yet without extraction both have their physical harm to the digestion system and body aswell.
When it comes to Bodhi’s experience, I can share it too. All the substances including DMT-derivates cause openings and then you fall back below the level before. Recovering takes some days to weeks. Still it is way more smooth and subtle unlike mj here =P
At least here all of the substances had their colourings and limitations so the experience may inspire like hell but you can never fully know that later on the natural unfolding will be like that. I’m thankful for all the experiences back then. And I’m also happy that the phase has passed and the practices do their work of clearing the clouds more and more together with an ever more happy body-mind on all levels through that which is beyond all loving and joying all.
Bravo. Keep on truckin’. 
Here’s a great book that you can order for about 4 bucks on Amazon…it’s called “The Natural Mind”…highly recommend it:
http://www.amazon.com/The-Natural-Mind-Revolutionary-Approach/dp/0618465138/ref=sr_1_1?ie=UTF8&qid=1342988650&sr=8-1&keywords=natural+mind#_
For what it’s worth, DMT is found endogenously in humans: http://www.scientificamerican.com/blog/post.cfm?id=dmt-is-in-your-head-but-it-may-too-2010-04-16
But it’s never been proven to be secreted or synthesized by the pineal gland: http://www.erowid.org/chemicals/dmt/dmt_article2.shtml
Love!
Carson 
Read both of those articles the day I posted my take on DMT here. Both are interesting reads. It still opens questions on what is the main purpose of DMT being always resident in our bodies, and what role it ultimately plays in nature as a whole.
Ahh the mysteries of the universe. Gotta love it. 