I didn't know about them, and I had spent a lot of time with the documentation and code of everything I touched (language, dependencies, etc). Looking things up reinforces this. The value of a feature such as autocomplete is marginal to me as a function of the effort I have to make to learn how to use it properly, the frustration of using it improperly, and the added steps to fix a blunder, so I just don't bother with it.
I also have a habit of having the documentation/book/code of a dependency open nearby and doing my look-ups there.
A lot of time is spent refining existing code, debugging, optimizing, refactoring, etc...