Java is the only language I've ever met where an autocomplete might be a net positive, since the ecosystem is full of excessive verbosity. I'm not confident about that, since I don't write anything in Java if I can help it.

For other languages - typing is never the limiting factor, and actually reading the docs is better than praying that your IDE gives you something meaningful. For languages with a working REPL (or even a typo-detector) you can use that if you really need to introspect.