I think it depends on what you are trying to learn and who is teaching the class.
There are many courses for photography around here, the bar is set very low for the teacher.
Taking classes taught my a master at the craft, that has recognition and skill, it might be worthwhile. Taking classes at the local junior college from a teacher with no portfolio and recognition, no thanks.

If the intent of your question is to decide whether a degree of some sort would add to your bushiness, most likely not.
When choosing a photographer the proof of your skill is in your work. It is in your portfolio.