I feel people either love or hate Stephen King. I was the same as you, absolutely loved his work from the get go and devoured everything I could.
Personal favorites:
IT
11-22-63 - not horror based mostly but cool concept.
Dark tower books - these are his holy grail, everything connects to them.
The stand - I just love the feel of this book, it just feels right.
Seriously try the dark tower books. I've reread them multiple times and it's such a great experience.