I'm not a native of Sussex and I might be more conscious of distinctive forms of dialect precisely because of this (and the fact that my family comes from Tyneside, where respect for dialect is inculcated into everyone at a very early age), but I've known the word "druv" (as a uniquely Sussex word) for YEARS.
The language is richer because words like this survive.
couldn't agree more, forms part of an identity...