We usually buy one Family Picture on Main Street every year. We have all the rest taken but we also have the photographer take the same picture with our camera. That way, we have the "official" picture plus all the others with everyone in them for only the cost of film and developing.
*** By the way, we were told by a very nice cast member and also by a supervisor at the Magic Kingdom, that it is Official Disney World policy that all employees MUST take pictures of guests with the guests camera if asked to do so***
The supervisor told us a story of a family asking a man with a name badge on to take their picture , so the man did and only after he left did another worker tell the family that the man who took the picture was the Vice President of Walt Disney Attractions just walking through the park.