It's never come in use as part of my development role, but every now and then I get a task that I'd write a small program to automate, which I now force myself to do in powershell and it takes less time.
For example, I recently moved hundredsthousands of files from one server to another using xcopy and forgot to set the attribute to preserve the creation dates on the files. Powershell to the rescue. Within ten minutes I had a script written and tested that copied the creation dates over without having to re-copy the files.
