Comment by throwaway2037

OMG. This is exactly my experience after trying to write code first for 10+ years. (Yes, I am a terrible [car] driver, and a totally average programmer!)

"Bad programmers worry about the code. Good programmers worry about data structures and their relationships." - Linus Torvalds

He wasn't kidding!

And the bit about "immutable structures". I doubted for infinity-number-of-years ("oh, waste of memory/malloc!"). Then suddenly your code needs to be multi-threaded. Now, immutable structures looks genius!