A _very_ large portion of our PlayStation2 engine is written in assembly.

Decent chunks of both our GameCube and XBox engines are written in assembly.

Our main Vector, Matrix and Quaterian classes and support functions are written in assembly.

Ive been writting games professionally for almost 4 years and I''ve yet to write any assembly. I know how, but im better at coding other things.

My experience with this industry has thaught me that to be successfull (and to keep your job) you must know everything or at least have a vague idea how everything works and if you come across something new, you learn it and learn it fast.