zsh made by lazy people, for lazy people

Larry Wall: one of the most important virtues of a programmer is laziness

we're already reasonably lazy in the shell
history recall (aka the up arrow key)
tab-completion for filenames
command line editing (Ctrl-A, Alt-B, Alt-F, Ctrl-E, Ctrl-W, ...)
aliases

but you want to be more lazy, even if you don't know it yet!