A close family member of mine is schizophrenic, and, as I understand it, they've always (or, at least, for the past 5-8 years) relied on a combination of drugs and these sorts of therapies to manage their symptoms. That is to say, the drugs are helpful for helping to keep their thinking organized and reducing the frequency and severity of hallucinations/delusions, but those issues never really go away completely, and sometimes a given drug regime stops being effective for whatever reason, so it's very important to have (and to practice!) strategies for identifying when your thoughts are "right" vs "wrong," and being able to deal with the problem effectively when it's the latter.