My issue with workers is that their need happens in spurts: early wonder/settler chops, jungle chops, cottage spam, city spam, wartime road spam. Then windmill replacements, workshops on plains, and finally railroads spam.Damn, that's a lot. I tend to go over 1.0 only if there is jungle to chop.
Shaving turns off those transitions I find makes a big difference; but the more workers I prepare for them, the more workers I have doing inconsequential tasks afterwards.
I've actually toyed with the idea of a 1.5-2 worker/city ratio until my windmills and roads are up (machinery-engineering), then deleting down to 0.5-1/city (usually running pacifism so the worker unit costs are doubled) and using my first renaissance war to capture the AI workers required to get myself back to the higher ratio for State Property workshops later railroads.