A good solution to that problem is to take the bride and groom pics by a professional (or a skilled friend) at a different time and location. If your wedding party is at a different location than the wedding ceremony you have a time slot which can be used for photos. Or take them before the ceremony, when everyone isn't tired or fed up. (Against tradition, perhaps - but since no one is around except the bride, groom, the photographer and a friend or two, no one is going to object).

There will still be some photo sessions of all the guests and all, but with the bride+groom pics out of the way those family photos can be done fairly quick. At least if you a) promise everyone that wants it an electronic copy of the assigned photographer, b) have someone with loud voice and the right mix of authority and diplomacy organize the photo session. You do NOT wait for Aunt Hilda's geriatric hands to fumble with all the buttons of her new camera - she either snaps when she has the opportunity or receives electronic copies of your skilled friends DLSR high quality pics.