I just don't see the point; after a certain amount of time together a couple is considered de facto, and they have pretty much the same rights (iirc, correct me lol) as a married couple. I'm not religious (apathetic agnostic), our families don't care, we dont and wont have kids... and it costs so damn much to get married, and more to get divorced.
There are so few benefits (imo, for me personally) that I see no point. My partner knows I love him, I know he loves me, we don't need a piece of paper to prove it lol.