Great list so far.
Without the DIS, I would never have known that you can book a portrait session at the resorts. We did fabulous family pictures last fall at Grand Floridian.
Without the DIS, I would never have known that you could purchase a CD of all your Photopass Pictures. And I sure would never have known that you could prepurchase the Photopass CD and save some $$.
Without the DIS, I would never have known that (at the time) you could receive an offer with the confirmation of your Photopass CD prepurchase that would give you a greatly discounted portrait session at GF.
Without the DIS, I would never have known to do the pick-a-pearl in Japan.
Without the DIS, I would never have known that instead of bringing a whole day's worth of bottled water into the parks, I could just bring 1 bottle and several individual pouches of KoolAid mixins (or Crystal Light, or Propel Fitness water mixins) and then just fill my bottle from the water fountain, use one of my mixins and have a great-tasting drink.
Without the DIS, I would never have known how truly nasty the water from the WDW drinking fountains taste.
Without the DIS, I would never have known how important it is to have a plan.
Without the DIS, I would never have known about rope drop, the importance of arriving early, or the beauty of an afternoon rest.
Without the DIS, I would never have known to start calling before the call center even opens to try to make a reservation for CRT.
Without the DIS, I would never have know to call the desk at Bonnet Creek (non-WDW condo we stayed at) to request a "fireworks view" room.
Wow, this is making me nostalgic. I'm ready to go back. For those of you planning. Have fun!
JenIN