Sorry if that bothers you. Something about lists makes a point by point analysis seem appropriate. Anyway, I'm glad you're happy and don't mean to shit on your marriage, even if I think the institution is silly.
I am focused on the piece of paper, since that is what marriage is. Two people who met before can run to Vegas, get married, and it carries all the legal power that your marriage does. If you want to say something like "Marriage is not just a piece of paper, it's also a _____", then why can't you have the ______ without the piece of paper?
I am from a divorced family, yes. As far as I can tell it was an amicable divorce. It seems natural to me that people grow and change as they get older, and sometimes they grow apart and each have incompatible goals. I don't think there's anything wrong with that. Given how many marriages end in divorce, I think that denying that possibility is kind of immature. "It'll never happen to me!" Yeah, right.
So here's how I look at the whole "partner through life" thing. If you're lucky enough that your goals remain compatible as you both mature, that's wonderful. But why then did you need to get married? If your goals diverge, at some point one or the other of you is going to have to sacrifice your happiness to maintain the marriage. In which case, what was the point of getting married to begin with?
And miscellanea, I don't call my GF's dad "Dad", but neither do her sisters husbands. So that's no big deal. Also if my GF were the type to want to get married, she probably wouldn't be my GF. I like the fact that she is highly independent and places no weight on meaningless ceremonies. And Luke, you might want to have a snack, you'll be waiting a while.
Oh and here's a tangential point. If at some point in the future, any of you are having trouble in your marriage and want to keep it together "for the kids", don't. Having happy parents is much, much more important than having married parents. My parents were divorced and happy. I had friend whose parents were married but fought all the time. That is much harder on a kid, and warps their sense of what a healthy relationship is.
Sorry about the essay, heh.