Overall it has helped me in a couple situations. I will say when I was onboarded I don't believe audio was mentioned and a quick search for things I know I said in Zoom recently comes up empty--perhaps that functionality is new?
For now, I've found that I haven't yet hit the equilibrium point where I've forgotten something badly enough to replace my instinct to use Spotlight, browse Finder, or even search Google Drive (shudders). The Fitness app on iOS needs 180 days of data before it shows you trends; I feel like Rewind is similar in that I need a critical mass of data and time before I truly don't know where to look and go to Rewind first. Audio support would greatly reduce that window, however, so maybe I am missing out.
Overall I definitely recommend trying it out, however!