I used it mainly for Java development, but Visual SlickEdit was a fantastic IDE for all of my needs. It is, however, a full IDE and you have to pay real money for it, but as you can see from the supported languages it does pretty much everything and the kitchen sink.

One of the nicest features in Java, and that I can only hope is supported for Perl, was the ability to point SlickEdit at any arbitrary directory and have it recursively parse any source tree contained therein. After parsing, you had tab-completion for all objects and methods on those objects. So for perl you could create multiple auto-completing libraries -- one for the Perl source, and as many more as you have personal libraries.

It would even fill in the appropriate variables in the method call based on the signature of the method -- although that, of course, would be a Java-only feature.

Disclaimer: I no longer use this application since I'm no longer a full-time developer and just pop into vi(m) when I need to do some coding. So, YMMV.