How to get the current directory of the cmdlet being executed
Solution 1:
Yes, that should work. But if you need to see the absolute path, this is all you need:
(Get-Item .).FullName
Solution 2:
The reliable way to do this is just like you showed $MyInvocation.MyCommand.Path.
Using relative paths will be based on $pwd, in PowerShell, the current directory for an application, or the current working directory for a .NET API.
PowerShell v3+:
Use the automatic variable $PSScriptRoot.