Marriage is a legal contract. Period. Instead of a best man and maid of honor, you should walk down the aisle on the arms of your lawyers.
You'll probably never realize that unless you file for divorce, and at that point you may be completely shocked at what you signed up for when you walked down the aisle!
In my opinion, the government should have no place in personal relationships between consenting adults. If you want a spiritual commitment, that should be between you, your partner, and the Creator. If you want a legal contract, call your lawyers and get busy. The issues of social security, taxes, and health insurance are important, and should be egalitarian, IMO. (Of course, I believe in universal health care, which would make the latter issue moot, but that doesn't exist yet.)
If you believe that current legal marriage affords you the right to make medical decisions or end-of-life decisions for your partner, you are in a fantasy world. You must RIGHT NOW execute a health care proxy and power of attorney even if you are married.
Don't get me wrong, I'm not unromantic or anti-relationship; I've been with the same man for more than 8 years, and we're very happy, thanks. I just fail to understand what the State of New York has to do with it.