I agree with your thoughts on the weaknesses of Lovecraft's negative descriptors. In the early 80s, someone published a set of his complete works in paperback and I made the mistake of reading it all straight through; I was burned out for years. Luckily, I was able to re-ignite an appreciation for him in the last ten years or so.
Lucky break today in the world of movies. Fearnet put up a movie called The Zombies of Mora Tau
from 1957. Allison Hayes is in it. I'd never seen it before, but it has old-school zombies (not exactly Voodoo, but close enough). It was very good. Worth watching, or picking up if it's on DVD.