I cannot recall the last time I wanted to move 16 lines - that would imply I stopped to count the lines. What I invariably want to do is "move down one paragraph" (C-down) or "move to that spot I can see on the screen" (1-6 lines, tap up/down; 6-30 lines, hold the down key for about a second until I'm within a line or two, then tap up/down a couple times; >30 lines and use pgup/pgdown to get closer). For anything further away than that, I'm going to use isearch to get closer.
Sometimes I want to make a complicated motion in the horizontal and vertical axes at the same time in a context which is not well-formatted source code and hence has no good paragraph/word landing points. For this I move my hand slightly further and grab the mouse. It always amuses me watching people try to do it "the right way" and then spend 30 seconds trying to work out what sequence of buttons will get them there, then spend another 30 seconds remembering what they wanted to do when they got there.
I'm not trying to minimise the number of logical keystrokes, I'm trying to minimise the time and distraction of navigation. A few simple operations combined with key repeat seems to work really well. Lots of people seem to neglect the power offered by key repeat.
I'd love to meet somebody who could navigate source code faster than me and learn how they do it. When I do, I'll probably change my approach. However, I've worked with a lot of different people who used a lot of different approaches (yes, including that one where you display the line offset from point and type the number of every jump) and in the past decade I have not found any of them to be faster than me - although I have found a few who were roughly the same speed.
