You may find the beginner course a bit tedious, but it's good reinforcement. OTOH, most MSF and others have an Experienced Rider Cource or Confident Rider Course that is intended for returning and experienced riders looking for a refresher. I've taken the BRC and the Intermediate courses, the later more than once. Used to do it every couple, three years to have someone external looking at my riding habits and giving me positive tips on what I had slacked off on, or what was being done right.
It's not uncommon to feel frustrated and wonder at the end of the day why you bothered taking the course. But then... The next time you go out for a ride, you realize you're doing it better. You're good habits are reinforced and your bad habits are fresh in your mind and corrected. Riding smarter, safer and still having fun doing it. That's a Win.
It's also fun to see where you fit in the classroom portion. Sometimes you are on your game and nailing it. Other times you realize you've been forgetting to look farther ahead or look for those danger signs and it's a wake up call. It's sometimes a little scary to see how some of the others are doing too, YClassMV. I wanted to ask one guy which way he was leaving... so I could go the other way! He was genuinely that bad.