Something I didn't know until recently:

zsh does not require cd to change directories.

Using the directory as a command implies "cd". For example, instead of doing:

me@server:/home/me $ cd /tmp
me@server:/tmp $

You can just do:

me@server:/home/me $ /tmp
me@server:/tmp $

That's three whole keystrokes (nearly half the command shown above), all day long.