Love 'em. (Given I like the couple getting married, of course.) I think they're fun and I like the planning phases. Wedding gowns? Beautiful. Love the shopping-for-them-part and the walking-down-the-aisle-in-them-part.
Here's the rub: I have no interest in getting married anytime soon (if ever). I also could never, in a million years, wear a wedding dress in any popular shape and/or form. Except for the party part, I could never tolerate the actual act of getting married. I do think tiaras and registries are cool though (if I was the one getting the gifts). I wish I could wear a tiara for other occasions. And register for like my birthday or something. That would be very worthwhile.
Here's my point: I think it's only possible to be really, truly happy for another person when the thing that they're getting/achieving is nothing you'd ever want in a million years. Or possibly if it's something you already have or already achieved. If you disagree, leave examples. Otherwise I won't believe you.