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Short answer: graphics, machine learning, and file caching (which the OS does automatically for you).

Long(er) answer: For the most part, the entire system benefits from it. Across the stack you get a boost because of file caching, and the boost it gives to I/O dependent subsystems which make the entire system faster.

e.g. you don't need to use machine learning explicitly to benefit from it, macOS uses it heavily for some operations (e.g. text identification when you open an image on preview).

Sorry it's a vague answer, but the nuances of the benefit are highly dependent on the workload.