I develop applications using PHP or Java and will study Perl for the first time.
For PHP and Java, there are integrated development environments such as Eclipse, and
What I use -- and what I've gotten the impression that most other serious Perl developers use -- is a good text editor. The only "integration" I have is via user-defined tools. For Perl, that's these:
perl -Mstrict -cw <file> # Perl "lint"
perl <file> # run file
perl -d <file> # run file in debugger
I have others for checking files in/out of version control, browsing history, etc. A good configurable editor (I'm partial to UltraEdit) will allow you to build your own environment using the tools you want instead of foisting an all-encompassing solution on you.
As Sinan stated, there are some IDEs for Perl. Padre is worth a mention. It is being actively developed by the Perl community.