tbf I still don't use autocomplete. It's mostly man pages (or their language specific equivalents) and stackoverflow for me. That said, I don't program anything terribly complex.
I'm curious! What's your reason?
My strong belief is that autocomplete encourages the use of more descriptive identifier names and therefore is one factor that can encourage more readable and maintainable code.
But I'm certainly not the world's most ultimate programmer.
Now I'm at the stage where I'd prefer to just think at an architectural level and let all of the tedium be abstracted away. Copilot is like autocomplete on crack and I love it.