> also the autocomplete in Visual Studio Code which was really great across a bunch of files <...> I wonder what other good autocomplete is out there.

I am in the same boat. I tried looking for tab/auto-complete implementations ~ a year ago and it was pretty disappointing. If that has changed, would love to know!

Windsurf has free unlimited tab complete, I use it as an IDE alongside Claude Code and it works pretty well. I think Google's Antigravity also has free tab complete but no idea if its any good.