On a related note, I've personally observed that it also helps a lot with:

1. Generating (or simply repeating) obvious ideas in a domain that I am not an expert in

2. (With some prompting) Generating creative ideas in a domain that I am familiar with

3. Generating obvious ideas in a domain I'm familiar with when I'm too tired to think or preoccupied

Not only do you get a productivity boost by being an editor but it also complements human energy cycles

The downside is the risk of atrophying one's own mental ability to generate such suggestions if excessively relied upon. Given my druthers, I'd prefer to be a generator of text ChatGPT would want to absorb than to be a consumer of the mystery meat it is regurgitating.