I think that homeschooling leads us to seek out those moments to learn together as a family. Those times have become precious to me, and I feel the girls will always remember them. And yes, I know you don't have to homeschool to have family learning activities. But I think that I would not be so compelled to do those things if I did not feel solely responsible for my children's education.
It just makes me happy when learning and family time are all wrapped up together, snug in a blanket on the trampoline under the stars.