I found this one particularly interesting:
The spooky voice that narrates the Haunted Mansion ride is that of the Pillsbury Doughboy. An actor named Paul Frees, who was to Disney what Mel Blanc was to Warner Brothers, supplied the voices for both, as well as many of the pirates in Pirates of the Caribbean and most of the characters in “Great Moments With Mr. Lincoln†(except Abe himself). He was also the voice of John Lennon in the old Beatles cartoons and Boris Badenov in the Rocky & Bullwinkle Show.