> You go to fix a bug, one of the first things you will probably ask is "what calls this code?". Being able to do that, right up to the top of the call hierarchy, instantly, without having to run the system is a huge advantage.

This is indeed useful, and languages with semantic IDE tools are indeed better at it. But this works for me in JavaScript 90% of the time with just text-based (and I think it probably tracks imports) tooling.