Research on the effectiveness of psychotherapy strongly suggests that longterm therapy is just as effective as longterm therapy + drugs for ALL disorders
What do you mean by ALL disorders - Bi-Polar, Schizophrenia, ADHD? If so, I don't think most psychiatrists would agree with you. My Bi-Polar BIL recently committed suicide when he went off his meds and tried only natural/vitamin and counselling approaches. The research we've done and the opinion of his doctors suggests that this was an unfortunate decision. He was an athelete and felt the drugs affected his performance.