Disnee Dad Says....................................Think of this as 3 five day trips. We are only three, but on our last ten day trip we only checked one bag, and that was they changed the way they counted carry ons, in 1999 we checked no baggage. I would also do laundry more often, you can pop out a load or two while the kids swim, doing a weeks worth seems like it would take a long time. Also, everything we pack can be washed at the same time if need be, all cottons or permanent press with no delicates or colors that might bleed, satin, silk, etc..
DW loves it because at home I do 4% of the laundry!! At WDW I do 100%. Take child down to swim, start up my two loads. It takes about 1 1/2 beers to wash and 1 1/2 beers to dry. I bring it down in a suitcase, and for a one beer bonus I neatly fold and pack everything back into suitcase. Mom is happy for the two hour break, child is happy to swim, and I don't know but for some reason I'm happy too!!!!!!!