"I have zero examples of people who have used the methods of rationality ... to help with the problems they have that most people don’t have..."

I have. Extremely much so. Although I REALLY don't want to discus my problems publicly like this, I can't find any other way to communicate the necessary information: I used to be extremely irrational with a large number of mental-illness-calibre delusions, and now I am, despite the occasionall bizarre failure mode and despite still being mentally ill in non epistemological ways, I'm catching up with LW in terms of sanity.