As far as I know, all the info on Snopes in correct.
Snopes is generally reliable, but not comprehensive. By that, I mean they don't address subjects that aren't related to an existing urban legend. Some Disney incidents tie in with urban legends or are legends themselves, and are reported on by Snopes. Some are not, and receive no mention from them.
Also, while I have found Snopes to be a generally reliable source of information about certain subjects, their articles are not sourced nearly as well as most of those on Wikipedia. With the majority of Wikipedia articles, including the one I linked to above, the reader can easily check each and every reference listed at the bottom if they want to confirm the information. Snopes provides some references on some articles, but I wouldn't rank them better than Wikipedia in that respect.
I would hope that all of the following are true:
1. That accurate information with references is more valuable and useful than unsourced speculation;
2. That reading the Wiki article completely would leave the reader less worried, as it makes it clear that the majority of the incidents at Disney parks are not due to faults with the rides themselves, but rather due to pre-existing conditions or bad decisions made by the park guests;
3. That WDW is overall a very safe place to be.
David