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Besides the built-in templates/html, there's also this https://github.com/a-h/templ Haven't used it yet, but seems promising

Actually, just remembered why I haven't used it. Although it "Ships with IDE autocompletion", last time I checked that's only on the Go code, not the HTML. Usually I keep my templates as .html files, and find the IDE autocompletion and linter on the HTML more valuable

I used Go's templates/html package. I simply converted Rails' ERB files into Go tmpl. It's not as pretty, but it works well.

> it seems you have to go with a JS framework for view layer and write APIs in Go

Yes. Unless you are builing a static site.