Assembly language is great and will teach you a lot of how the computer really works at a low level. Everyone should write their own asm optimized triangle drawing routine at least once. It's not something you need to learn every detail of - that's what references are for, but it's definitely good to have some understanding of. People talk about how you should learn functional languages like haskell as it will make you a better programmer, even if you don't use it. The same is true of assembly language.