To me, one of the best thing in Rust compared to C++ is that I no longer have to be super careful all the time to avoid common pitfalls, I just write stuff and fix compilation warnings/errors until the compiler is happy, and things mostly just work (apart from domain-specific bugs of course)

After getting used to the basics of Rust, I found the cognitive load to become much lower compared to C++. There's just no way I could write correct C++ code in such a careless fashion.

So now I can spend brain cycles on things that actually matter, and it's great.