I've spent the last few days aggressively parallelizing some Rust code with crossbeam, and it's really just... painless (once you're used to Rust). Rust actually understands data races, and it grumbles at me until my code is provably safe, and then everything Just Works.

The Rayon library is also lovely for data parallelism.

Sometimes, I think, "Rust is basically a nicer C++ with the obvious foot guns removed and great tooling", but then there are those moments where I'm just blown away by what a good job it does.

(I think it helps that I have some functional programming experience under my belt, and that I tend to use mutability sparingly, and mostly in very simple ways.)