I am disabled and I was wondering if they still have the Special Assistance Cards from City Hall.

Click on the Disabilities FAQ link in my signature. The information is there for you. Be aware that they have become more restrictive about the GAC just as they have at Disneyland, but at WDW, almost all attractions are fully accessible from mainstream queus. If you have endurance issues, you would be well advised to bring or rent an ECV. The distances between attractions and distances to the parks and resorts are MUCH greater than they are at Disneyland.