> I think cache friendly code also tends to be reason about friendly and debugger friendly.
Not sure what examples you have in mind, but the very first things I think of when I hear cache friendly code are cache-blocking and cache-oblivious algorithms, which are quite the opposite of that. See also B-trees vs. binary search trees, etc.
I usually start with simpler things like paying attention to locality of reference and adjusting data so that it takes up less space in memory.