Since
Disneyland has more locals, you don't notice the gift cards as much as you do in Florida, but they are the way to go!
This is just anecdotal, but to me, those gift cards process a lot faster than credit cards. It's seemingly instantaneous from when they swipe the card to the receipt popping out!
As others have mentioned, carry some spare cash for the off chance you need to purchase from an ODV cart, but for mainstream purchases, bring those gift cards.