I found a great article on failed theme parks and one of them was a clear inspiration for Itchy & Scratchy Land, it also sheds some light on why the Mayor of Springfield is named Quimby. Take a look:
Quimbyburg, located in Downey, California and named in honor of producer Fred Quimby, was MGM's entry in the amusement park race. The studio's ambition was to give the park the "MGM touch," with a general lavishness to rival that of Disneyland itself. But MGM officials made the fatal error of assigning Fred "Tex" Avery to head up the project. A skilled animator, Avery was wholly inexperienced with the quite different demands of dealing with the human performers who had been hired to portray Tom and Jerry, Droopy, the Avery Wolf, and other famous characters who populated the park.
Avery learned only through a series of on-the-job mistakes that if a human performer's limbs were made to fly off the body, they could not be reattached as easily as with a cartoon character. It also took repeated accidents with anvils for Avery to realize that it was not a good idea to drop them on park employees.
Nevertheless, the MGM name made the park the most successful of the Disneyland imitations until the morning of December 3rd. 1955, when, during a parade inspired by Avery's cartoon Bad Luck Blackie, an ocean liner was unintentionally dropped on hundreds of parade spectators. Quimbyburg was hastily closed, and an attempt to reopen it in Czechoslovakia in the early 1960s under Gene Deitch's supervision was unsuccessful.