Disneyland Imagineers do TOOONS of optical illusion. Most building are all made with optical illusion. The most notable is the Christmas Tree during the holiday. At the Top, the ornaments are made to look small while the bottom, the ornaments are huuuuge. It makes the tree look taller.
The WHOOOOLE Park is actually on a slope. Sloping upward which ToonTown is the highest point. Now when you look any building it looks taller!