And to the OP, they happily accept big bills all day long. $100 bills are perfectly fine.
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I have brought $100 bills to WDW several times and have never had any trouble having them accepted in the parks and resorts. If you had any concerns, you could go to the front desk of your hotel and periodically ask them to change your $100s into $20s. They should be able to do this for you with no problem at all.
My money maven Scrooge McDuck and I are pleased to share that yes, cash is still accepted at most locations throughout the Walt Disney World Resort. This includes all four theme parks, Disney Resort Collection hotels, dining locations, and Disney Springs.
Your Disney Rewards Dollars will expire five years from the date they are posted to your account. You will receive a notification of any soon-to-expire Rewards Dollars on your monthly credit card statement, so be sure to keep an eye out for any new notifications.
Lastly, you'll want to take some spending money with you. How much spending money will you need? Around $50 per day per person is a good start. A bit of extra cash is great for buying snacks, souvenirs, and alcohol.
I'm excited to see that you're arriving any day now to the Most Magical Place on Earth, so let's get right to your question. My money maven Scrooge McDuck and I are pleased to share that yes, cash is still accepted at most locations throughout the Walt Disney World Resort.
As Disney stopped printing the money, the dollars have now become very valuable. Certain prints and series are worth more, based on rarity. The Disney $5 Mickey Mouse bill from the 1980s is a rare item, for instance, and will sell for far more than $5.