As you identified, length is the real key to secure passwords.
Nice cartoon. I totally agree with the cartoon, as far as passwords that we need to remember and input regularly are concerned. I've long been a fan of using Diceware to generate passwords (well, really passphrases). It's the combination of using real words, length, and the randomness of throws of dice that makes it work so well as well as reasonably easy to remember. For situations that require special characters or capitalization, I use the dice for that, too.
Then again, for a password that I seldom have to use, like my router at home, I personally wouldn't have any problem with using one of those random, nonesensical passwords and putting it on a sticky on the bottom of it. If some stranger can physically read that sticky, then I have far more pressing problems than a hacked wifi connection!