Good programmers worry about the algorithms. Great ones worry about the data structures and the relationships between them. If memory serves, it was Kernighan.
"Show me your flowchart and conceal your tables, and I shall continue to be mystified. Show me your tables, and I won't usually need your flowcharts; they’ll be obvious." - Fred Brooks, The Mythical Man Month
And two threads with some further discussion I found while looking for these quotes: