In July 2011, a well-known bitcoin awareness and education project lost almost 7,000 bitcoin. In their effort to prevent theft, the owners had implemented a complex series of encrypted backups. In the end they accidentally lost the encryption keys, making the backups worthless and losing a fortune.
I don't even think that beginners need to be so over zealous and use complex passwords that they would soon forget. They could use unique passwords that only them can understand and has cues if they suffer amnesia and forget it.