I use languages which have as little syntax as possible (Lisp family, Clojure+ClojureScript recently), and then I make heavy use of what my editor (Emacs) tells

I use languages which have as little syntax as possible (Lisp family, Clojure+ClojureScript recently), and then I make heavy use of what my editor (Emacs) tells me when I start typing a function name. Also, I use Dash.app (highly recommended if you're on a Mac). Basically, I remember very, very little. In fact, the older I get, the less syntax and function names I can remember. This is not something I'm worried about, though — this gets replaced with better intuition and systems thinking.