- It allows a user to easily extend their current work environment (i.e. MS Office applications). Other languages and IDEs could do that, too, but not so easily. This allows users to somewhat more gracefully extend their documents/data and knowledge instead of starting all over again with a "proper" programming language/environment.

- I would not call it fast or resource-efficient, but fast enough and efficient enough for most unsophisticated purposes.

- No red tape for installation, IT cannot (easily) disable it, isn't an extra line item on any bill