The 1040 changes just about every year although it's usually just updating line numbers and various amounts (e.g. standard deduction). The 1040 schedules often get updates too.
IME everything else stays the same (e.g. the 8000s forms), but there are so many of them that it's a lot of work to just see which ones have changed and if you have to care about them. The forms also become less formulaic. E.g. If you file 6251, you need to keep your own records about Alternative basis, so you can't just fill them out based on w2s and 1099s.
