This is a special case of the general fact that I enjoy being reminded that people are fascinating, complicated things, and they try to make themselves and each other happy, and they succeed and fail, and try and despair, and the whole dance is repetitive and terrifying and beautiful. I enjoy hearing other people's stories and problems and thoughts, and seeing the variations played upon such timeless themes. I enjoy learning, and perhaps, every now and then, maybe actually having some tiny morsel of insight to offer.
Friends are a good thing to have.