I think traveler’s checks are totally unecessary unless you are traveling to a region that doesn’t take plastic or have local ATM machines.
I haven’t used traveler’s checks for years when traveling in the US. On our recent trip to WDW we used our debit and credit cards, just like we would when paying for anything near home. It’s Florida, not Siberia.
Then only place I’ve used traveler’s checks in recent years in out in the sticks in the back roads of Greece, when we stayed at hotels and pensions that didn’t take plastic. And even then, for the most part, we’d withdraw cash from a local ATM first. Most of our traveler’s checks came right back home with us.
Our debit cards have no fees and no limit on what we can spend each day. (there is a limit for what you can withdraw out of an ATM each day, but not for debit purchases.) If your bank is doing that, I’d keep shopping for a bank! Or possibly join a credit union.
I think the travelers check concept is outdated. Take them with you on safari - you won’t need them at WDW.