yikes! Does anyone actually use this?

Just memorize the 12 words. It's really not that hard. But also, keep a physical copy somewhere as a backup. There are better ways to make sure they can't be used without some additional information. For example, just inscribe your passphrase(s) in an OP_RETURN. 😜 If someone happens to stumble across your 12 words - good luck to them also stumbling across your passphrase(s) amongst the rest of the blockchain.