[SlySherZ]

For me, the most awesome part is the debugging experience out of the box. If you're programming for NodeJs (or other supported languages, with a bit of configuration), you can click on the side to add a breakpoint and hit F5 to run, step over your code and hover variable names to see what they hold, evaluate expressions to change things and stuff like that. Still in the JS world, VS Code uses the TypeScript engine to infer variable types and detect type errors, which by itself catches a lot of bugs.

These features aren't unique to the JS language though. Extentions do have access to the APIs that implement these features, so you already have them available for most languages (with different levels of quality/completeness).