Hi! I think I may know how you feel, as we leave in 2 days and I am having a hard time focusing - worried about forgetting something!
Have you:
-taken care of mail/paper deliveries while you're gone
-acquired your LGMHs (if you plan to advertise you're a diser) at Home Depot
-made your ADRs and double checked any cancelled/changed ones
-checked in to the photopass option - OP is right, you save at least $25 for planning ahead
-gone essentials shopping (such as lots of sunscreen, bug repellant, and batteries for all of the gadget essentials - esp. if you are travelling by car and may need them for DVD headphones)
-purchased any other non-Dis attraction tickets you may want (Sea World etc. saves you lots if you buy more than 7 days ahead)
-stopped to savor the anticipation
Hope I have helped! Have a super trip!!