We always forget something but figure that if we do we will make do somehow.
My husband bought me a digital camera for Christmas last year that I was excited about using at WDW and yes I forgot it. My son forgot tennis shoes and shorts one year.
P.S. I pack laundry soap in individual zip lock snack bags and then put them into a small tin to put in suitcase. The tin allows me to bring things back in that I might be worried about getting broke or small items that might get lost.