DDD is sort of the OOP of OOP, without the clever Design Patterns. -- DDD is the kind of principles most OOP people can learn and apply in the same mechanistic way the apply OOP principles and that actually do pay off (unlike design patterns which are really clever but have very little impact in real world).

CQRS is associated with DDD because it is the kind of smart pattern made out of bits that the other smart patterns frown against -- like data duplication/denormalization.