How to write a PowerShell function to get directories?

Using PowerShell I can get the directories with the following command:

Get-ChildItem -Path $path -Include "obj" -Recurse | `
    Where-Object { $_.PSIsContainer }

I would prefer to write a function so the command is more readable. For example:

Get-Directories -Path "Projects" -Include "obj" -Recurse

And the following function does exactly that except for handling -Recurse elegantly:

Function Get-Directories([string] $path, [string] $include, [boolean] $recurse)
{
    if ($recurse)
    {
        Get-ChildItem -Path $path -Include $include -Recurse | `
            Where-Object { $_.PSIsContainer }
    }
    else
    {
        Get-ChildItem -Path $path -Include $include | `
            Where-Object { $_.PSIsContainer }
    }
}

How can I remove the if statement from my Get-Directories function or is this a better way to do it?