I've seen it all too often... the bride and groom have their first kiss, walk up the isle to hugs, kisses and champagne, then someone asks "so what about the family photos?" With no planning, the situations devolves into stress, shouting, even family arguments and I'm not joking when I say that I've seen brides in tears.
Forget that. The solution starts well before the wedding - making lists. Start thinking about your friends and family and making lists of photos - like you would make a seating plan - make a photo plan.
Then, before the wedding, ask a family member (even one from both sides) with a loud voice to have that list at the wedding. I find uncles to be quite good at this - and they love being involved too. It is then their job to find people for photos and bring them over to you and the photographer. The photographer can't organise the people in the photo because photographers don't know your family. Also, it's very hard for them to round people up - much better to have someone else round the family up and feed the groups to the photographer so they can concentrate on what they do best.
This way when the someone asks "so what about the family photos?" you can say - "uncle Bob has it sorted".