ES6 adds lambdas, destructing assignment, default/rest/ spread arguments and template strings - all of those reduce verbosity. And there is `let` which has a "normal" scope, although I'm not really sure it needs that. Additionally, generators let you use normal control flow constructs for IO, if you prefer that to FP.

While its no Haskell, it certainly isn't much more verbose than other dynamic languages anymore. And a typesystem like TypeScript or Flow pretty much eliminates the rest of the gotchas.

Off the top of my head, there are two embarrassing holes: bigger integers and parallelism. Can't think of anything else at the moment (macros maybe, but they're a double-edged sword wrt tooling). Wonder if anything else is missing?