Here's why:
* He personally oversaw its creation: Disney was deeply involved in the development of the ride, even taking a hands-on role in designing aspects like the audio-animatronics.
* It embodied his vision of global unity: "it's a small world" promoted peace and understanding between cultures, a theme close to his heart.
* He adored the music: The catchy tune, penned by the Sherman Brothers, quickly became a beloved classic and deeply resonated with Disney.
However, other attractions like "Pirates of the Caribbean" and "The Haunted Mansion" were also very special to him. He admired their attention to detail, unique storytelling, and innovative use of technology.
Ultimately, it's impossible to definitively say which was his absolute favorite, but "it's a small world" holds a special place in Disney history and likely resonated deeply with Walt due to his passion for its message and his involvement in its creation.