one wouldn't have to remember. if the address you gave out using the w3w-style encoder starts getting spammed, you can reverse it with the w3w-style decoder.

you'd need an app or a mnemonic device of some sort if you wanted to give an email out in public as opposed to sitting at a computer. but ideally on the computer when you notice spam you just reverse the email address back to who you gave it to; "target.com", "kroger.com"