Gorey is a magician who evokes humor without writing any jokes; large country houses as sets by showing nothing but a chair, or a bit of a wall; Victorian doorstoppers with only a handful of sentences. It's not at all surprising that his production of Dracula was a hit.
One thing that comes up in the books about Gorey is this idea of him as the godfather of Goth which I don't see: the Gothic for him is always mixed with the humor. The modern Goth seems more akin to the Romantic poets. While individuals have a sense of humor, I don't feel like the aesthetic does. Goth is Edgar Allan Poe not Oscar Wilde's Canterville Ghost.
Anyway, if anyone has other authors who combine Gothic and humor, please let me know. I would hate to think that I had missed someone.