If I'm on any computer that I can't get my IDE on, I use Vim as well. Here's a handy little bit of code for one's .vimrc file that allows for folding/unfolding of Perl subs:

function GetPerlFold()
  if getline(v:lnum) =~ '^\s*sub\s'
    return ">1"
  elseif getline(v:lnum) =~ '\}\s*$'
    let my_perlnum = v:lnum
    let my_perlmax = line("$")
    while (1)
      let my_perlnum = my_perlnum + 1
      if my_perlnum > my_perlmax
        return "<1"
      endif
      let my_perldata = getline(my_perlnum)
      if my_perldata =~ '^\s*\(\#.*\)\?$'
        " do nothing
      elseif my_perldata =~ '^\s*sub\s'
        return "<1"
      else
        return "="
      endif
    endwhile
  else
    return "="
  endif
endfunction
setlocal foldexpr=GetPerlFold()
setlocal foldmethod=expr
[download]

Here's a screenshot of what things look like if the above code snip is added into the config file (all subs are folded by default when opening a Perl file).

I keep a copy of my most basic vim config file in my Github for easy retrieval while I'm on systems I don't have control over.

Update: While in Vim's normal mode, zo will open/expand the folded sub, and zc will close it again.

Very nice! Here is a slightly changed version adapted to my own coding style (using '};' instead of '}' and pod documentation before each sub):

function GetPerlFold()
  if getline(v:lnum) =~ '^\s*sub\s'
    return ">1"
  elseif getline(v:lnum) =~ '\};*\s*$'
    let my_perlnum = v:lnum
    let my_perlmax = line("$")
    while (1)
      let my_perlnum = my_perlnum + 1
      if my_perlnum > my_perlmax
        return "<1"
      endif
      let my_perldata = getline(my_perlnum)
      if my_perldata =~ '^\s*\(\#.*\)\?$'
        " do nothing
      elseif my_perldata =~ '^\s*sub\s'
        return "<1"
      elseif my_perldata =~ '^\s*=head.\s*'
        return "<1"
      else
        return "="
      endif
    endwhile
  else
    return "="
  endif
endfunction
setlocal foldexpr=GetPerlFold()
setlocal foldmethod=expr
[download]

This will let the pod lines between subs out of the folds. The original version will fold the pod lines with the previous sub.

Very nice!

I've always put my POD at the bottom of the file (after a 1; and an __END__), so I just create a dummy sub as my last one, and the all the POD is folded as you said.

For me, that makes it easy to go directly to the bottom of my code, instead of automatically going to the bottom of the POD.