I can speak from experience. It helped me a lot. I play much better after having taken many lessons. It only opened doors and helped with my "creativity." Many of the players who can jam sans music education are limited to a few chords in one style. Many of their tunes start to sound the same. They can sound great, but again they are players and not so much musicians. I think Kurt Cobain is a good example. He was great at what he did but he was first an entertainer. If you can draw naturally well with one red paintbrush, why would you paint any worse if I handed you blue, green and yellow? There are exceptions. Some take lessons and still play bad. Some never take lessons and play well. An argument might be made that those who are not naturally talented take lessons. I probably fall into that category. I can play now though. Bottom line, the vast majority of people will only benefit from lessons.