Comment by zelphirkalt

If they are good at what they do, I think they are simply good at keeping things in mind, what everything is called, developing a good mental model.

Personally I often write code without LSP, and use pure text completions with Emacs (words of opened buffers) and cycle through them. I know the language well enough, or I look things up in their documentation until I know them well enough. Occassionally I will also use LSP, if it exists and is easily configured and works well.

Go to definition: If I don't have it, I develop a map of the project in my mind where I find what in a project. I have also observed how projects become not so well organized, when people rely too much on always being able to "navigate through code". One does not need to pay much attention to module naming or class names and the like, if one never na igates the file tree to go to the file. Sometimes I have to rgrep/ripgrep.