I've updated my post. I didn't mean does everyone have access, I meant is it even technically possible for someone with proper access to view the original file. If files are encrypted properly then no one at the company would be able to access them.
You might want to look into Tarsnap. It's more expensive and you don't get the fancy features, but they offer opaque encrypted file handling. Also, there have been a couple niche strong privacy centered providers that have commented in this thread.
I suppose one could create a Truecrypt container and have GDrive sync it in the background. Wonder if Google will ever complain about files they can't process.
Just like Dropbox does.