Actually, Disney's main drop off area is right on Harbor with about a 3-5 minute walk to the main entrance. There is a secondary drop off at the parking structure and another one at Downtown Disney as well, which while they are further walks to the park, are closer to certain other places. Additionally, while the trams are not running (which I think is likely permanent given that all other So Cal theme parks have eliminated parking lot trams), they have a ECV/Wheelchair rental location where the trams would normally load.