I have seen people scrub their driveway (my favourite was I was wandering down a terrace in Liverpool and the classic Liverpudlian old lady, scarf round her head, bucket and water, scrubbing brush on her knees doing the porch and little bit of road out front of her house.. could have been straight out of the 1930s but this was the late 2000s. Think
I want to break free), and you have pressure washers as well that squirt water but hard enough that it usually picks up any dirt or slime that is embedded into it. A general hose might get rid of dirt, sand, grass clippings and the like but little else.
As far as precious resource. Precious depends upon where, when and how.
At the same time did you take a dump this morning? In doing so you probably shat into 7+ litres of perfectly drinkable water and flushed it away (14+ if you had two flushes), rinse and repeat (pun intended) if you later went back to take a leak -- so maybe 21 litres at this point and that is cooking and drinking water for maybe 10 adults for a day.
As for leaf blowers. As mentioned they act as a something of a lazy man's rake (many also come with a vacuum mode as well these days). Can avoid having leaves to slip on (ask anybody that rides a pushbike or motorbike about wet leaves), and when leaves carpet the grass they can prevent light getting there, sometimes water as well if it skates off the top, and thus kills the grass. Blow them into a pile or onto your flower beds and you spare yourself that trouble.