That's a really interesting point. Personally, I never even taste the things that people make analogies to when drinking wine. An ex-girlfriend of mine would always ask me things like "don't you taste blackberries? or "Isn't this buttery?" and would be really disappointed when I said no. I don't think it's because I have a bad sense of taste though. In fact, I'll often be able to tell if I've had a specific wine before (if it's the same vintage) because I recognize the taste signature, and I can sometimes say which other wines I've had that it tastes similar to. I just don't know how to describe the flavors.