Right. I mean, basically you're as safe as your public-key/username. If you can make your wallet in some kind of very off grid way, the same way you'd have to use Tor; cash laptop, McDonald's wifi, etc.
It doesn't matter how secretive you are when you create the wallet, that's not where the privacy issue lies. The problem comes from your use of the wallet. If you only use the wallet to pay for digital goods and only access those digital goods through multiple layers of protection, then you're probably fairly safe.
But that's not very realistic. If bitcoin were to become the primary way to pay for things, you're going to be buying physical goods with it. If you order something online then they have your shipping address to associate with your wallet. If you buy something at a physical store then they can see you and know what wallet paid them.
And lets say you maintain one wallet for the secret all-digital stuff and another wallet for everything else (or however many wallets makes sense for you), it's better that way, but all you have to do is slip up once with the secret wallet to be screwed. Everything you did with that secret wallet can now be associated with you even if the transaction happened 20 years ago.
