Well, I can't necessarily seperate kids from adults because I watch a lot of the animated fare on there. That said, these have been my favroite things to watch:
The Imagineering Story
Star Wars: The Clone Wars Season 7
The Mandalorian
The Simpsons - any season
Talespin (this holds up pretty well)
The Right Stuff (currently through episode 4)
Magic of Disney's Animal Kingdom (currently through episode 4)
The Boys - Sherman Bros. Documentary
Howard - Howard Ashman Documentary
The old Pixar shorts that predate Toy Story - great to see the evolution of the computer animation