David Fincher's films aren't disturbing at all. They look like high-class music videos by a high-class music video director. The obvious exception being Se7en which has an amazing atmosphere. Don't get me wrong, I love his films, but they aren't really all that dark.
For truely disturbing cinema, trust one name (and he's not a good director at all -- but his stuff is disturbing): Andrey Iskanov. Also, a lot of Fulci films have given me an uneasy feeling...
I'd say, yeah, for a "mainstream" director, Cronenberg definitely has a lot of terrifying images.
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