I am using MultiEdit.
Comments have one background color, inline POD has different background color. Easy to see what is POD text, what are comments, and what is code (white background). Of course syntax coloring for both HTML and Perl.
Also I have templates expanded by space (i.e. after "if ", "wh ", or "sub ". Smart indent. Integrated FTP. Integrated compiler and compiler errors. Integrated C-like macro-language. And more...I am happy... ;-)
To make errors is human. But to make million errors per second, you need a computer.