My family just used Memory Maker in December and made it a point to get our money's worth.
If you are going on rides with photos, figure out where the cameras are. That way, after your initial ride, you can come up with fun poses for subsequent rides (some of our funniest photos have come out that way).
Scope out on the maps the locations of the Disney photographers, and then visit all of them - during the day AND at night. A photo in front of Spaceship Earth, for example, is great during the day, but takes on a completely different vibe when taken after dark.
Magic Shots - ask the photographers if there are any they suggest (or check this thread
http://forums.wdwmagic.com/threads/magic-shots.852689/which is updated with different Magic Shots and their locations every so often). This last trip we had one with Stitch popping up out of the ground and one with Olaf.
Make sure you are ready to have your photos taken. Know how you are going to group everyone - everyone together? Kids together, then the whole family? Mom and Dad in their own photo? Do you want glasses or sunglasses on or off, jackets on or off, etc.
Also, if you are carrying bags with you, keep them together or have someone collect them to put next to the photographer so they aren't in the shot - this keeps everything streamlined and often gives the photographer time to take more shots before moving on to the next family.
Ask the Disney photographer to turn around. This doesn't apply in some locations, but even though most area photographers are located where they are to take advantage of a certain spot (e.g. Cinderella's castle), you can get a great shot in front of the castle, or a great shot of the expanse of Main Street behind. Even if they have a camera on a tripod - they'll just change direction. A note - we tend to do this only when there are no other families (or one or two), waiting in line. If there's a long line of people waiting we aren't going to harry the photographer into waiting as our family shifts 360 degrees, lol.