However, when you are working with special system variables. They are so compact and non-descriptive they can be problematic to identify and debug. Imagine looking at $/ and meaning to use $\, talk about subtle.
I suppose a lot of this really depends on how oftern you need to use special punctuation vars. Most of my $work code (medium-large web app) I never use anything other than $@. And the longer version of this (IMHO of course) is just overkill.
English may have code that SHOUTS but it brings attention to itself with the upper-case syntax and is more descriptive than the built-in variable names.
I can understand wanting to bring attention to certain usages of these variables, but not all. With more common variables and usages (like $@) it ends up being a distraction to the visual flow of the code, and drawing attention to an "exceptional" case.