Other than what I had offered in my other replies, I only have 1. When I shoot weddings, especially larger venues, a prime simply would not work. As I work the perimeter of the action, a zoom is the only way to get the wedding party as they move to the front, and then also get the wide shots I look for. I could run around with 2 cameras, but during the action part of the ceremony, that isn't very much fun.
So I can shoot this...
then as the wedding party is in position with the bride and groom, I can move to a different location and shoot this. In this particular venue, there were multiple pools of water, and I didn't want to risk being a spectacle by falling into the water.
So it depends on the venue quite a bit, and where you think you will be positioned.
I have other pics where I am zoomed in on the ring placement on the hand, then I can zoom back out and get the overall scene very quickly without changing cameras. Many different examples that show in some cases, a zoom can be better.
Then again, I am not a pro shooter so others will have better suggestions.