I am not really on board with minimising kitchen things, I must admit. I think more in terms of minimising faff rather than plates. Washing up the same plate 3 times in a day, with 3 different bowls of hot water, is purist minimal, but to me it's making more work! Like Clearsomme, I like having enough plates, sharp knives, measuring jugs etc to complete what I need to,do in minimal time, without adding extra washing up onto the task list. It would be different if we didn't have a dishwasher, or we had a tiny kitchen,but we luckily have a dishwasher and some space so I use them to,stay as time rich as possible IYSWIM. It doesn't bother me that there are lots of plates on my plates pile, it's still just one pile.
We are skanky I know, but we are also out of the house a lot. Our routine is basically that the dishwasher goes on after dinner, every night. Anything from that day that didn't fit in gets washed up that night. Every morning the dishwasher is emptied, or failing that, we are lazy about clearing up after breakfast and lunch. In practice, if I do complicated cooking or extra baking I can see that extra washing up will need to be done, and I do the washing up as I go along thing (which works especially well at breakfast).
Maybe the key is to have equivalent amounts of everything. If you have one sharp knife, you will be washing up often, so you might as well have minimal numbers of plates and measuring jugs. But if you have a whole day's worth of knives and plates but only one measuring jug, and find you end up washing up the jug 3 times in a day, that's a mismatch. Either buy an extra jug, thus saving the washing up time, or reduce your number of plates and knives to save the 'stuff'.
Fuzzpig I keep thinking we need to simplify cooking too. DC have school dinners mostly so often end up eating sandwiches, then I cook for just DH and me. Daft. One thing we do, that helps, is we eat the same meal 2 nights in a row. No hardship, it's just normal to us but it cuts down the planning and cooking time, and I also think it saves money as there are fewer different ingredients to buy each week.