When you're working on a creative thing, everyone has an idea, and they're pushing it. The first time you work with anybody, you have to get comfortable with the way another person pushes hard for what they want. Familiarity breeds contempt, people say. But I've found, for creative things, familiarity breeds peace of mind, because you realize you know someone better. You trust each other. You know not to take things a certain way, or a wrong way. You get to where you don't have to waste quite so much time with diplomacy. Things are a little more efficient.