Sure you have directors like John Lasseter or Pete Docter that frequently direct films for certain studios, but often, you get a solid variety of films made by people you've never heard of and that provides for a film experience akin to watching a filmmaker's directorial debut.
To me, every animated film is an opportunity to showcase different writing and directing talents, as animated studios rarely keep the same director for every single project. It didn't really hit me why I eagerly anticipate animated films each and every year, whether they be from high stakes studios like Pixar and Disney or low-key efforts from Blue Sky Animation or Rainmaker Entertainment.