Nim is **not yet** used in interactive style, because the tools are not there yet.
For example, Nim could be used for Interactive Notebooks like Python. And as soon as Nim could be compiled to JS, even pure Browser Notebooks are possible, like [Observable](https://observablehq.com/@uwdata/introduction-to-vega-lite). So, I think the interactive capabilities of the language are important feature, even if it's not yet used heavily.