I can’t recall any movies before Toy Story that made a point of using A-list screen actors for the characters’ voices.
The big one that comes to mind, pre-Toy Story, is the casting of Tiffany in “The Jetsons Movie”. (Not that Tiffany was ever “A-list”) Many people, including Janet Waldo (the original Judy Jetson) were quite upset by that. Post-Toy Story, Dreamworks tends to cast “names”, rather than voices.
