I use G15 macro's to input my passwords.
Five accounts, five different passwords.
Maximum characters, letters, symbols, numbers.
Up to 2 of the same type before switching to a different type.
Not a chance in hell of remembering it; used to copy/paste before the G15.

Well, will probably go to a simpler password in the near future.
And likely the same password for each account.
The blizzard authenticator is enough security.