I don't really worry about the size of the part much any more. It's nice to have more time to work on the character, and to have big scenes to play. But if there's something playable there, and if it's interesting to do, then that's nice.
Be fair with others, but then keep after them until they're fair with you.
I've been lucky enough to live through all the things that are supposed to give meaning to our lives, like parenting, grandparenting, art, celebrity. All these things you expect meaning to come from, and sometimes it comes when you're not expecting it.
It's a funny feeling to work with people who you consider your colleagues and to realize that they actually are young enough to be your children.