If anything, an IDE helps discipline. Of course it has syntax highlighting, but then so does emacs. I can't imagine why anyone would want to do serious programming without it. I'm not into hair shirts.
For the life of me I can't imagine why you think one would "lose one's edge over an IDE". Maybe with one of the super IDE's like IntelliJ or Delphi that write most of the code for you and you just sort of point and click, but Perlbuilder at least is not like that. You have to type everything in yourself.
PS I just downloaded an evaluation copy of Perlbuilder 2. I must have it, NOW! It fixes all the minor annoyances I used to have with version 1.
helgi AT decode DOT is