The main issue is that "simplicity" is a very ambiguous thing. If your language is "simple", you need to write the same low-level code again and again every single time, making your own code NOT simple. Pushing all the complexity away from our program into the language means that our code is simple, which is much more important. Any improvement to the compiler is spread for free to every single program compiled by it.
that's a different practice though, just uses the same tool (visualization). The goal is not happiness/serenity/inner strength but powering up your memory.
Basically it's a non-superstitious variant of the prayer meditation practice well-established in Christianity (she talks about modern evangelical Christians, but there's also medieval mysticism).
It seems to use the same mechanism that makes us feel a nasty presence when going to bed right after watching a horror movie.
I think that it might help cope with life better, sort of a mental refuge like Buddhist meditation (which only makes sense if you believe in reincarnation), but I've been procrastinating trying it, because I'm quite sceptical that it works and that it's worth the massive effort. One thing is if you actually think it's a supernatural Being watching over you, another if you know it's just an illusion.
(I'm a go user, though)