Go for it. You can always benefit from becoming a stronger cyclist and a good coach will give you workouts that challenge you and help you out. I had a coach for the first time last year (I was 47 then, a recreational cyclist). There were a couple of organized rides where I wanted to just ride better. As it turns out, bad influences led me to some racing -- I learned a lot that way, too. In the fall I dropped the coach, thinking I hire him again in January.

As it turns out, I ended moving to another different city, and I decided to get another coach to keep me sane. With the stress of the new and city, I decided having the coach would be a great incentive to force myself to workout. This coming week I will get a taste of the results as I will fly back to the midwest to participate in a gravel race with several friends.

You definitely can learn from the workouts you are given. I have friends who got a coach for a while and then decided they had learned enough to train on their own. I enjoy having someone assign the workouts and discussing the outcomes, getting feedback. The workouts on the trainer can definitely be challenging -- on Thursday I had one that left me totally out of breath, with achy legs (5 min lactate threshold intervals).