Using a strong password does help a lot even against the attack of cracking the leaked/stolen hashed passwords back to the original passwords. The problem is that few of us can firmly remember many such strong passwords. It is like we cannot run as fast and far as horses however strongly urged we may be. We are not built like horses.
It is too obvious that the conventional alphanumeric password alone can no longer sustain the need of the age and we urgently require a successor to it, which should be found from among the broader family of the passwords and the likes.