To take two GC'd languages, I'm proficient in both Java and Scala. It usually takes me a little longer to write something in Scala, but when I'm done, I've almost certainly written fewer bugs in the Scala program than the Java program (I've also written many fewer lines of code, but that's another topic).
For me, it's the type system that helps the most. Given that Rust's type system is much stronger and expressive than Go's, I do expect to write fewer bugs in Rust than in Go. But it does feel like, if I had more experience with Go, I'd be significantly faster writing Go than Rust. (Then again, the more I write Rust, the fewer write-compile-fail-fix cycles I have to go through, and the compiler's ability to accept code as safe improves pretty frequently.)
Still, though (and I know this isn't the question at hand, but...), I personally value greater chances of correctness at compile time way more than development speed. While some types of bugs can be a fun adventure to track down and fix, most bugs I encounter are some mix of boring and annoying. I honestly would prefer to spend 2 weeks building and 2 days debugging over 1 week building and 1 week debugging. I really do find debugging that annoying. (Fuzzy numbers; I don't actually think I'd build 2x as fast in Go as Rust.)
