We have extra toothbrushes, hairbrushes, etc. too, that always stay in the travel toiletry bag. A few weeks before any trip, I'll buy an extra deoderant for each DH and I, more mini shampoos, etc -all the stuff we need so that everything can be packed the night before (we often leave middle of the night). Last trip I even packed a new set of contacts, new contact case and new bottle of solution. It was time for new stuff anyways and that way it was all set.
I try not to pack too early, either, cause then I just keep adding stuff!! We drive, and there's only 4 of us in a Stow N' Go minivan, so we can basically take anything we want but I don't want to take that much! I will say - I've gotten accostomed to a washer/dryer on our beach vacations, so nice to come home with very little laundry. I'd love to stay at a Villa at Disney with a separate bedroom and laundry (probably wouldn't use the kitchen much, other than the fridge!). I think the Poly needs villas!!!