I don't use it as much as I should, but I have used it enough to respect it and I have seen some dramatic results for other people (my wife in particular).

It is the work of an engineer who several years ago decided he would go through the New Age jungle and find the things that actually seemed to work. EFT is the result and is strictly empirical ("It works!") with no explanations offered. It is simple and everyone is urged to try it on different things and report back to the EFT website. Admittedly it attracts a lot of attention from the "periphery" but that has nothing to do with whether or not it works.

Regarding the "subtle" energies in our bodies, I recently read a paper about how we heal a wound. It seems that an injury results in a release of calcium ions into the damaged area. Ions bear an electrical charge. That charge serves as a "battle flag" to cause the various white blood cells to flood the area to defend and heal. We are each a miracle.