Personally, I love zsh.
Generally, you probably won't notice the difference between it and bash, until you want to quickly do things like recursive globbing:
Or use suffix aliases to associate specific progs with different suffixes, so that you can "execute" them directly. The below alias lets you "run" a C source file at the prompt by simply typing ./my_program.c – which will work exactly as if you typed vim ./my_program.c. (Sort of the equivalent to double clicking on the icon of a file.)
Or print the names of files modified today:
print *(e:age today now:)
You can probably do all of these things in bash, but my experience with zsh is that if there's something I want to do, I can probably find it in zsh-lovers.
I also find the book 'From Bash to Z-Shell' really useful.
Playing with the mind bogglingly large number of options is good fun too!
