I remember every single wedding I have photographed and they've all varied enourmously. As I only do a limited number each year, I can get to know each couple closely meaning I can give them a level of service and attention that makes them all really memorable to me.
Unobtrusive, professional & unseen yet always there.
I always send over a highlights gallery the next day, I find this incredible valuable to the couple but also to the parents. Then when I hand deliver the finished product I sometimes see a few prints adorning the shelves and the fridge in their home. This gives me pride, not in my businesss/company but in the results that I produce.
Plan early, work out the logistics with your photographer early. You're not there to pose for endless photographs, get involved and trust the photographer to achieve what you asked of them in advance.