A Suica card is still worth it for convenience for any time spent outside of Disney world and for things like Maccy D's / Convenience stores - if you have an iPhone / Apple Watch you can just load it up and you won't forget / lose it as it's in you wallet.

This is just an extra bonus tip when I was at USJ and I'm sure the same applies to Disney too the food prices inside the park are abhorrently expensive - it might help you to reduce costs if everyone can make do with some packed convenience store lunches (obviously outside of the deliberate restaurant experiences for experiences sake)