The projects I do are mostly frontend in React and backend with TypeScript/Node.js.
I have around 10+ years of professional experience although I did on/off hobby coding before that since 15 years ago.
It's mostly API endpoints, calling a database, third party APIs, data transformation, aggregation type of things.
Then either UI according to what designers provide or whatever I want to do for my side projects.
I think it's of course wildly more productive multiplier for side projects, since then it's mostly about typing things out since you know exactly what you want to do and being a little off doesn't matter.
I don't want to share any of my actual code right now, but I think one example for example is a React component that needs to fetch some sort of data, e.g. using @tanstack/react-query, then it does loading handling, error handling boilerplate things for me, which some of I change to what I specifically need for that situation, but I need very few keystrokes myself to get the initial boilerplate out that I then edit, and during edits it of course also gives me decent suggestions. And it will create the component prop types based on the args I pass to the component etc.
Then with backend, it's really good at data transformations. E.g. combining different datasets, reducing etc.
How well it picks the correct libraries and patterns depends on the project and I think how much I've navigated around, I'm not fully sure how the context is exactly passed, so usually I will feel it out and adapt code where necessary.