I think zen is the keyword. Apps like textmate or this one or mac os/apps in general are not simple because it's cool to be simple - they just hide the power that's under the hood so your tired eyes and brain can focus on the task at hand. But ultimately it's about your own zen: whatever makes each one happier and more productive, be it eclipse, netbeans, vim or textmate.

I really want to break out of the terminal.

Have you tried MacVim?