I am going to add to what Rob said, we all learn new things with this hobby, while most of what we learn for the most part only pertain to the hobby, but we are still learning new things, and knowledge is power, and makes us better .
How many of you guys have come here to this forum or any other model forum, or for that matter Google because you were seeking information on how to do something when its comes to building models? and I am sure you learned something, right?, so while building models may not be educational in the true sense of education, we are all learning new things on how to build better models. I am sure there are a lot of us that when we starting building models did not have the first clue on how to do award winning paint jobs if you will, but you learned by seeking out the knowledge on how to do better paint jobs.
I will agree that what we learned to help us build better models will not help us in other forms of our life, but we are still learning new things