The "speech therapy" I had in elementary and high school did basically nothing for me. Afterwards I got into a speech therapy program at Purdue University and it changed my life. It helped the professor in charge of the department was a stutterer himself, but him and his students that ran the sessions were amazing and taught me so many techniques I still use today(19 years later). It's important to remember there is no cure, and like any regular therapist, you have to find the right one for you. But when it works it can have a huge impact.