Isn't this an argument in favor of IDEs vs editors?

As much as I prefer the philosophy of Emacs/vim/sublime + cmdline tools, code completion is never great (see Yegge's "grok" rants).

I really enjoyed a project I wrote in Java inside Eclipse, because code completion really helped me not open Google all the time. But I hate everything else about Java...

Contrast with Go, where achieving flow is hard because you can't even f* compile with an unused import. And I love everything else about Go (fast compiles, easy deploys).

(One could argue that if I haven't memorized the smallish Go standard libraries I'm not smart enough to work in the field...)

Notch livecoding a "minecraft clone" for Ludum Dare is a great display of what you talked about: familiar problem, familiar environment, great speed. Unfortunately we can't do the same with Fabrice or Jeff...