Personally, even if I was straight I don't think marriage is of personal importance. If two people are right for each other they'll stay together. A marriage certificate isn't going to change that. However, I think the right to marry is an important stepping stone to being treated as equals, as a precedent for future issues, for the satisfaction of those who choose to marry and to assuring benefits, etc., to our chosen family.
You don't see the 1,400+ rights granted under marriage in the US as important?