[prussian]

I'm surprised autocd was not mentioned. I saw

  alias ..='cd ..'
  # etc ...

But not.

  shopt -s autocd

zsh also has this. This seems like the fastest way to navigate since you no longer need to type, or retype, cd.

[feintruled]

Hell yeah, I've been missing this functionality since the Amiga shell days! I should have known it was in there somewhere.