I write full app suites that have less than 9000 LoC. I tend toward fewer, large-ish source files, separated by functional domains.

I once had someone submit a patch (back in the SVN days), that was massive, and touched everything in my system. I applied it, and hundreds of bugs popped up.

I politely declined it, but the submitter got butthurt, anyway. He put a lot of work into it.