1. Don't use Google Drive. Who's forcing you to?
2. Why not go with Dropbox? Oh, right, they can do the same crawling through your data.
3. Finally, uhm.. Thought about encrypting with TrueCrypt and uploading the entire encrypted file?
Ahh, but why think proactively about security on a free service but useful service when it's much easier to complain and bitch.
To be honest I'd actually trust Dropbox quite a bit more than I'd trust Google. Dropbox after all is not in the advertising business, it is not like they'd have any value with my data.
I was actually initially having the same sentiment as GP, but in the end I just threw up my hands in sweet surrender and went along with it. Let's face it, I use Gmail, I use Gtalk, I own an Android phone, I use Google search.
Google already knows more about what I browse on the internet, what sort of links I'd prefer to click, and should they somehow have the ability to weaponise themselves they even have real time GPS coordinates to order a surgical strike on me using some low orbiting satelite mounted laser... courtesy of my Android phone.
Having 5gb more of my reports, resumes, and other various documents (which they probably already have countless duplicates of already thanks to Gmail) is not going to do them much.