@Mike. I even sometimes insist on a few formals because I KNOW there will be someone in their family (grandma, I'm looking at you.) for whom that is most important. They're pretty easy to bang off pretty quickly, though, thankfully (the photos, not grandma..).
Just for background, I'm asking these questions because I aspire to push PJ style shooting into the category art. I'm a long long way off. I find that although I'm able to get aesthetically good candid moments, and although I feel like my photos 'add up' to a story (in the trivial sense I pointed out), I still feel like I'm only able to pick out 3 or 4 or 5 photos from a wedding that are even close to the threshold that I aspire to.
To answer my own question (prepare for an analogy), the child who wanders around taking photos of the day (and whose photos add up to a story), doesn't necessarily understand the relationships between the things and people he's photographing. He groups differently. He might fail to pick up on something that is physically small but of large importance in terms of meaning. Moreover, the child doesn't have a sense of existing narratives with which to play. That's a dense paragraph.
What does it mean to find a story when you are in a room in which people are simply standing or sitting, occasionally sipping from a wine glass, and talking to others in clumps of 2 or 3 or 4 ?