ZSE is great. In fact, Eclipse as a platform is amazing. I decided to go back to ZSE after getting acquainted with how Eclipse functions... so beautiful. Perspectives, completely customizable interface on the fly... ("Oh man.. I need to see another file at the same time and I don't want to put it on my other screen... *click* *drag* yay!").

Not to mention it has all of the Eclipse plugins available to it. While the setup is a little more advanced than most newer programmers tend to prefer, it delivers tenfold in performance and features. If you want to ease yourself into the Eclipse world (which I highly recommend getting into)... try out Eclipse PDT or Aptana. Aptana is great because its geared towards newcomers to the Eclipse world.