The fact that the Golden Rule has lasted for centuries is evidence that it's not pure garbage.
As OTWO said, the Golden Rule doesn't cover everything but it's a good place to start when considering others.
Actually, the reverse golden rule is used far more often. If you run around assuming everyone wants things like you, then you won't get very far. People often mistake societal customs and norms for the golden rule when in fact they aren't the same at all.
Used as written, the golden rule is a terrible place to start. It's "lasted" because Jesus and reasons and people calling their behavior the golden rule when in fact they are doing the exact opposite.