Everyone caps their agent so a human can still check the output. Has anyone actually solved that?

The advice that keeps coming back is to keep each run small enough that someone can verify it end to end. Small diffs, small task scopes, one thing at a time. It works, and it also means the agent runs at the speed of whoever is checking it, which is roughly the opposite of why anyone bought one in the first place. What do people here actually do once the volume goes past what you can read? Not faster review, something structurally different.