It depends, I am over a year in Rust and it doesn't take me that much longer to write something in it than say in Python. The confidence I have that the thing I wrote is way higher in Rust and it is usually much faster.

And: it is incredible easy to build and deploy.

I think whether Rust is useful or not depends entirely on the application. If you need high confidence in what the thing is doing, it should run parallel and fast and you are familiar with the concepts Rust is using – it isn't a bad choice. For me it replaced Python in nearly every domain except one-use scripts and scientific stuff.

It can be hard for advanced programmers to abandon certain patterns they bring from other languages though. In the first months I tried too much to use OOP, which doesn't make any sense and leads to convoluted code. If you work more in a compositional and data oriented way while making use of Types and Traits, you will end up with much simpler solutions that work incredibly well.

Katherine West's RustConf 2018 Talk on ECS Systems describes this incredibly well and might be even good to watch if you are never intending to use Rust at all, because the patterns discussed are quite universal: https://www.youtube.com/watch?v=aKLntZcp27M