I've been doing the same thing in VS Code for Julia/Python, but the experience is much worse than LightTable [0]. It's slow, the interface is clunky/janky, and noone has invested effort in designing the UI to make navigation/information clear and accessible.

[0] Admittedly LightTable was pretty buggy so it wasn't all fun and games. But still - I would love for my day-to-day development environment (Dart/C++) to look like that.