Even still - there really wasn't much in the way of gore in Trick 'r Treat. The "goriest" scene was actually fake, within the context of the film.
... It is pretty funny to read that stuff about older films, though. Even Halloween itself is remembered as shocking and violent, where there's very little on screen violence. The Texas Chainsaw Massacre conjures up images of Leatherface hacking away at body parts with a chainsaw, despite the violence being pretty tame in comparison.