I agree. "Geek" has become, to me, anyway, a synonym for "enthusiast". One can be a computer geek, or a business geek, or an artisan bread geek. One characteristic trait of any kind of geekdom is using jargon with an inappropriate audience.
You'll have to pardon me, I've got a batard that needs to proof.
I think the use of the term "geek" is reasonable: I am seeing that term apply more and more to anyone with a deep/obsessive interest in a subject.