While we don’t know exactly how many people had annual passes to Disneyland, the number is significantly north of… a lot.
This is not a bad thing.
We also don’t know how many annual pass holders were Southern California local who visited the parks frequently, as in weekly or even daily, but it seems quite clear that number was also pretty huge.
A whole bunch of people in the parks one any given day were AP members, and that means that even when Disneyland is able to be open close to capacity, the park will likely feel less crowded than it did before the shutdown.