I think information density per visible page of code in the IDE matters. It relieves you of a lot of mental overhead. By visible density I include mouse-over to

I think information density per visible page of code in the IDE matters. It relieves you of a lot of mental overhead. By visible density I include mouse-over tooltips. For this reason I don't like code lenses because IMO they waste lines in the visible reagion. When I want to look at a signature I mouse over it. I think from the syntax, strong typing, and algebraic type signatures F# is the most information dense language I have come across, while still allowing for readability. Maybe something like brainfuck is more information dense.