For some reason, diet coke basically makes me high. Sometimes it also just happens at random. As such, altered states are fairly mundane to me. I've found that, just like melatonin helps with insomnia, and valium helps with pain, I can use this to help manage depression.

So, I'd agree with "mundane" but I don't think that disqualifies them as useful. It feels rather dismissive to say that "says more about the artists pre-existing ability". Some people, yes, have different talents and skills, and some people struggle against various neurological limits as well. If something helps, even if it's just bringing someone up to "average" functionality, I'd consider that a positive.