I have never been in a situation where I had to wash salad first after something greasy was washed.
Neither have I. For more elaborate menus or meal prepping several dishes for the week, I can make a workflow plan that avoids that. Anyway, I can only use one sink at a time. I don’t have a second one, but I’d like to have one.
But cooking with two or three people? If I force everyone into
my workflow plan, the good mood won't last; you can’t really drink that much while cooking (but you can try).
Besides, for two people, with a lot of work in the kitchen, better workflows naturally arise, provided there are two sinks. It’s like having two ovens, one with pyrolytic cleaning, one DGC. You don’t have to have it, but it definitely makes life easier for frequent users.
but in a kitchen I'm already visually bothered by a sink that always looks used.
Why does it always look "used"? What does a "used" sink look like?
Either I wash something in it, then dry it for 10 seconds afterward or clean + dry it for a minute. Or the items go into the dishwasher. The sink always looks like a sink.