I don't find the comparison of a woman getting a head injury on the Haunted Mansion to a child getting abducted very convincing. While I'm sure the accident was upsetting, it is hardly news. WDW is a big place, accidents do happen, and there isn't really a villain. The abduction or attempted abduction os a child huge news everywhere. I live in a major media market where the newscast covers a tri-state area of 12 million people, and any story involving the abduction or attempted abduction of a child is huge news. If anything happened at Disney, you could hardly miss it.
Snopes is a very reliable website that refutes urban myths, as Crisi said. It is also a very popular website. If their report was incorrect, someone would have, by now, presented a link to the news story, or a copy of the police report, that supports these myths. Nothin'.
As the website notes, scarelore is around to remind people to do what they should be doing-- looking after their kid, and covering all the bases. But that doesn't excuse the fearmongering. Some people love to believe the worst and stories like this feed that.