Another goodie is how modern browsers support modern JavaScript. Basically everything I needed transpiler few years ago just works: const, lambdas, classes, even imports. Supporting only modern browsers when you start sounds like a good idea and if you ever need old browsers, you can always transpile to ES5 later.

Also don't forget that while CSS is still lame, it got few goodies as well, like CSS variables.

The only thing that I personally miss is how to set up Chrome to be a proper IDE. I know that I can edit files from the disk, it has autocomplete, but this whole UI is kind of weird. May be I just need some tutorial.