
Maybe it's not something innate though, maybe this is a fear that was set in early? In which case, Ron Howard has a lot to answer for, because the scene in Willow where the evil Bavmorda turned everyone into pigs was pretty horrific for a kid's film. Or it could be earlier than that, I remember watching re-runs of The Incredible Hulk as a child and hiding behind the couch whenever Dr. Banner turned into a green Lou Ferrigno.
I suppose that also has to do with why I find there are very few good Werewolf movies. An American Werewolf in London was the pinnacle merely because of the chilling and amazing shapeshifting scene, and I've never seen another that has effected me so much. I feel kind of cheated sometimes when a film depicts someone turning into a werewolf as a quick change, or where it will happen offscreen. AAWiL set the standard, and if it's not a horrifying change, it just isn't a proper Werewolf movie.
Now, I don't really believe in desensitization, at least not to a huge degree. What's scared me for many years before still scares me now. I don't mean that I'd watch Willow and be as freaked out as I was when I was just a wee nipper, but that Body Horror still effects me as it always has. British Sci-Fi series Doctor Who has had some pretty creepy moments, the episode Blink was one of the most genuinely terrifying things I've seen on TV in a long time ("Don't blink, blink and you're dead!"), it was creepy stuff. But it wasn't that episode that freaked me out the most, it was a later episode called Planet of the Ood, and towards the end, one of the characters was turned into a grotesque cthulhu-like alien lifeform. True to form, I was utterly creeped out and the scene left me with a knot in my stomach. I'd say the old fears just don't leave us.

The other thing in Pet Sematary that effected me was the scene where Jud Crandall gets his achilles tendon cut. The very thought of it makes me wince, it really unsettles me, and no matter how many times I see a scene of tendon-trauma in various films, it's something that I have never gotten used to. That's another reason that I don't truly believe in the idea of desensitization, I just can't see myself ever getting used to violence to that particular area, it cuts through me and sets my teeth on edge. There's a scene in Hostel where one character's achilles tendons are cut, and we don't even see it happen, we see is a reaction shot and the aftermath, but to me that was by a vast margin the most disturbing scene of the entire film.
That's not to say that any old scene of body horror or scene of physical violence against the ankle area will make a good horror for me. I would say that to make a truly great horror film, it can't just contain something that will scare or unsettle you. Pet Sematary is a great film in its own right, even without the scenes I've mentioned, and I've seen elements of what scares me in other films and they've fallen completely flat. I think a film has to engage you first and foremost, and that's why The Fly or An American Werewolf in London are absolute classics. If it doesn't have interesting characters that you care what happens to, then the film will fail.

Violence and gore certainly isn't everyone's bag, but I think in the right context it can be extremely effective and provide for a truly powerful film experience. That's not to say I don't love the more traditional ghost story, because the likes of Don't Look Now and Ringu count as some of my all time favourites. There's simply nothing like a good horror that piles on the atmosphere and doesn't really on cheap shock-tactics to scare the audience. The Others and The Blair Witch Project were two films that built up the tension slowly, and they were truly fantastic horror films.

I hope this has been an interesting read. It's been fun for me trying to lay out my fears, to relate what disturbs me, and what makes a powerful Horror experience for me. I'm sure that just as everyone has their own preferences when it comes to the genre, we've all got different things that will scare and disturb us, things that we've never gotten used to in films and things that can still freak us out. I'd love to hear from you, what is it that effects you most in a Horror?
