Man i do think this is a big step for windows , it's 2016 and still complex to pull a du -sh or df on windows. Things we take for granted on *nixes. Much love.
According to http://stackoverflow.com/a/868290/259130 function directory-summary($dir=".") { get-childitem $dir | % { $f = $_ ; get-childitem -r $_.FullName | measure-object -property length -sum | select @{Name="Name";Expression={$f}},Sum} } I could get a shorter non exact version if I was on windows.
They have neglected the CLI for years and powershell while I guess it has its uses for scripting is light years behind *nix stuff as an interactive shell.