I saw Salem's Lot when I was 10. Interesting enough, I saw Return to Oz at about the same time and found that scarier, but when I watched both again as an adult I found Salem's Lot scarier. I didn't start having vampire nightmares (at least not common and really scary) until I was almost 12. I read Salem's Lot sometime after it and found the book very intense (more than the movie).
I saw Blade at the cinema when I was 15...being that I was a runaway at the time (as were others who saw it with me), I found it spoke to me very well so that I thoroughly enjoyed it (if in a somewhat symbolic sense), but I wouldn't see it again for years, and I don't even recall thinking about it much after (though I'm sure I must've, at least a little).
I did like the first 3 vampire books by Anne Rice when I was 16, but it was more for the story, the way the author just brought historical (and modern) scenes to life (though she quickly lost me after Queen of the Damned). I thought most of the main characters (including Louis and Lestat) were annoying, however, though fascinating storytellers (as books were told from their point of view).
It was about this time that I joined others in playing Vampire: the Masquerade, and this is what truly drew me in out of love rather than morbid fascination. (The players didn't like Buffy and I didn't watch it then, but I did see the televised version of V:TM and Buffy is so much better than that. Granted, I didn't know anyone who was a fan of the TV version of VTM, and if anyone was then they were probably unfamiliar with the game/story given how much they got really wrong.) Still, overall I prefer vampires to be demonic monsters rather than romantic interests. They can be sexy, but it should be part of what makes them scary, and I still prefer them as scary monsters.
That said, I can enjoy good guy vampires. I believe the first vampire hero I found compelling was
Jander Sunstar that I first read about in
Vampire of the Mists when I was 17.
I didn't start watching Buffy until I was in my 20s, after so many promoted it to me (some of them neopagans who took it more seriously than they should), and I quickly fell in love with it.