I haven't used the specific gvim perl-support plugin, but based on it's documentation, and the screen shots it looks very nice. I typically use plain vim, without the gui, for nearly all my editing so I don't find much use in integrated development environments with menus and button bars. The Perl support in plain vim is essentially the syntax file for highlighting, much as it is for any language. But the great thing about vim is that it has all the great features of vi with many extras, most of which revolve around functionality that make it a nice programmer's editor. Those are all available in gvim as well, so even without the perl-support pluging, gvim would make a very nice environment for programming, debugging and maintaining Perl code.