>I mean, I get that coming from the other direction, powershell seems like a nice treat. And if you use it, colour me impressed. I know in some cases, it's the only option for doing script work on Windows machines.
Your dismissive attitude towards PowerShell makes me think you either haven't put much time into using it (if any) or haven't touched it since the 1.x days (even then the benefits over a string-based shell should have been obvious). It's a really good shell and is in a completely different league than sh/bash/zsh. It's not the best scripting language and there are still warts but until they make a solid and practical Ruby or Python based shell it's going to sit far and away from the rest.
If the many replies you've gotten haven't been enough motivation I encourage you to actually try it out for a while.
