First of all, we have to distinguish two possible meanings of "learning about philosophy".
The first is learning about the history of philosophy, which means discovering the different schools of thought, its theories, thinkers and their arguments.
The second is exploring the ability to "make philosophy ourselves". Even though philosophy is not exactly made, it can be stimulated from certain debate and/or individual analysis of any premise, eventually leading to a conclusion.
For both of these situations, i believe the answer is that it is absolutely useful, in a meaning that it can bring benefits to the person who dedicates himself/herself to it. For example, improving reasoning skills and getting in touch with fresh points of view in a variety of matters.