It's not that the plan isn't available to FL residents...it's that they are eligible for other discounts which may make the plan less attractive.
To get the plan, you have to book a MYW package which basically includes a rack rate room (not discounted) and at least a one day ticket. You can buy the one day ticket in the plan and upgrade it to anything you want.
Depending on how you eat, the DDP may or may not be better than the 20% off Tables in Wonderland card. For us, it usually comes out about even...If you like the signature restaurants, Tables in Wonderland is a better value.