We take all of our money in cash! Completely crazy I know, but it hasn't caused us a problem yet and is easier to divide between tips, Universal money, Disney money, Walmart/shopping money etc. We used to use the FairFx card, but had a bad experience on the day before we left for home as a till malfunctioned at downtown Disney, so a large payment went through 3 times, we phoned FairFx straight away, but were told that it would be 24 to 48 hours before the money was back and available to spend, as we left the next day it was a bit of a pain, but in fairness stopped us from spending more money!
So its cash for us.