What I'm sensing is that it is not so much the music which gets to us so much as the attitude of the people involved. This is certainly true for me. Few of us, I think, expect weddings to be musically groundbreaking, but provided things are gone about in the right way, most of us can put up with the more pedestrian/daft choices on the understanding that it's "their day".
I've found that where I play, weddings tend to fall into two categories:
i) The couple is pleasant and appreciative , (in most cases local, but not always) they've been to church, so you know who they are, they communicate with you, EVEN if it's to tell you they want "Here comes" (Wagner), "There goes" (Mendelssohn) Jesu Joy, Lord of Dance (after having pointed out the sky turning black on the Friday) and Jerusalem
ii) County do's, pushy parents of the couple whom you have never before seen, pushy women (sorry, it is usually women) doing the flowers, more often than not hideously over-the-top lily arrangments on mock stone plinths, braying yahs "Giles, you old b*****d, I haven't seen you since Gstaad" but for all that not a penny in the collection plate...
Granted, the music for a"ii" wedding might be marginally more interesting, but overall give me "i", any day of the week.