Even thought the Park are closed and reopening soon,Disney still has essential employees around doing their jobs. For example Animal Kingdom, they have lots of animals to take care of and even some new babies. Epcot , Flower and Garden show was going on when the parks closed so all of the topiary's around Epcot still need daily maintenance. 4000 acres of gardens need daily care too.
Something else Disney is saving lots of water, like 500,000 gallons a day. They use over 700,000 a day but, I'm sure laundry around all the property is being done somewhere.
Finally something really nice. Disney still has the Flag raising and Flag retreat every day at The Magic Kingdom. Pretty awesome! Way to go Disney!