Depending on whose count you believe, there are 500-800M Excel users in the world. So it's more than order of magnitude (if not two) smaller than Excel.
You could argue it's the most commonly used FP language, too.
I'd go one step further and even say it's arguably the most popular Reactive languages as well.
VBA inside office for sure
That's got to be bigger if you count legacy code
I wrote a 3D flight simulator in Excel vba for fun once.