I started using a tail light at the end of the 2020 season, and anecdotally it seemed like cars gave me more space. I don't know if it's the improved visibility or awareness, but I'm certainly a convert. I'll use the light all the time and will look for a good front light, too.
I don't know anyone who's been killed. Locally (maybe everywhere, not sure) people will put white painted "ghost" bikes where fatalities have occurred, and I can think of several around town.