Coda (1) is a great tool for beginners, if you're just figuring out HTML/CSS/JS/Wordpress/PHP/Terminal/etc. It also works well for those who are not supposed to be too technical – designers, for example.

As you become a more proficient developer, you begin to appreciate the configurability and extensibility of textmate/sublime/emacs/whatever over the polished but limited workflow conventions of Coda. (At least I did, Sublime FTW!)