Here's some food for thought (that means, I don't think I have any thesis or conclusion).
There was a thing in "Vogue" (possibly just online) recently about things brides ought to do these days. One of the things on the list was that brides should not hire a professional photographer, but simply gather up photos shot by their guests.
Predictably this has all the people who pretend to be professional photographers on the internet up in arms. They see their imaginary income being threatened by some blogger who's writing a pretty ordinary "I will just say the opposite of a bunch of stuff" post, and they decide to rant and rave a bit.
Here's the thing worth thinking about: If photographs destroy memory, perhaps no photography at all is the correct answer for genuinely important moments in your life.
You trade crisp, unchanging, 2 dimensional pictures which will tend to get fixed in your mind as The Memory of The Day in. What you get in return is a much more organic, malleable, but 3 dimensional and multi-sensory memory. You'll remember what people said, you'll remember how the music sounded and what dinner tasted like.
As time passes you will increasingly remember it differently from how it really happened, but maybe that's OK.