For a language that more or less DEFINED automation, I find it regretable that there's no serious visual tools that automate things like gui creation in Perl
I used The GUI Loft and ZooZ 5 years ago. It's sad they're not updated, they were pretty good tools.
OTOH, you can do a lot of good job with just typing the Tk code. You don't need the GUI designer in the most cases, because the tool allows you to be faster with the keyboard than the mouse. For a serious perl-lazy developer like me that means a lot. I can type faster this Tcl code "pack [button .b -text Exit -command Exit] -padx 10 -pady 20" than setting it all by mouse.