Here are some other things, which we have found useful or wish we had:
1) Bottled Water - Disney's is $2.40 a throw. Whether
vegging by the pool or storming the parks, it's easy to
get dehydrated.
2) A cooler with wheels - To keep all that water in. Very
helpful because SAB is a long walk from the villas. Nice
not to have to carry it.
3) Buy the refillable mugs - if your family is big soda
drinkers this will pay for itself fast.
4) Film - If you still use film cameras, bring it with you or
buy it in Orlando offsite. It's very pricey at Disney.
5) Medicines - You need a home equity loan to get a
bottle of Pepto Bismol, Dramamine, or the like at WDW.
Bring it from home - you'll likely be eating more and
richer food than usual.
6) Beach towels - Nice big ones. The towels at the pools
are just too small.
7) Rubber pool shoes - Another thing you don't want to
have to buy at WDW.
8) Patience pills - If only these existed. It's hot, it's
crowded, and (pardon the un PC here) foreigners are
always cutting you off while walking or in line. As
much as you want it to be, vacations are seldom
perfect. Crummy things happen - just relax and roll
with them. You (and your kids) are on vacation.
Have a great time!