Very interesting responses. Since I've been mostly described as an INTP, I'm gonna comment about me.
I like space - which means that I don't like having stuff that I don't need. I see keeping old things that you don't use as impractical, space-consuming, reasonless. For some reason, it even feels good after cleaning up the stuff that I don't need anymore.
Dishes would pile up for a couple of days until I'd unleash the power of washing machine over them.
Clothes would be in the washing machine likely as soon as there'd be enough to fill it up - it only takes a few minutes to set it up and a bunch of smelly clothes lying around isn't good for comfort (smell...?) nor for health.
I don't dust often. The things that I use don't get dusty and cleaning the dust off the top of my PC case and my monitor isn't dusting.
Since I don't like having useless stuff, there isn't many things lying around. Things get untidy on my desk, but I organize them from time to time. And besides, I don't keep much clutter here. When cooking, I put things back where they were - why keep food I don't eat out in the open? It'll annoy me the next time I'll be cooking since I won't need, for example, flour.
I do organize my files from time to time, but they do tend to get disorganized if I add lots of new stuff. Most often that happens when I'm frustrated due to my PC being slow or crashing and I "just want to get on with it." That happens quite often.
Unlike my family members, I always clean my hands after eating something that gets them dirty (grease, sauce, apple juice after eating one, etc.). By that I mean that I never touch anything until they are clean. I find that very disgusting. In fact, I don't even wet the door handles after washing my hands - I want them dry the next time I'm gonna use it. And anyway, usually I eat clean - I don't drop sauce on my shirt, table, etc., my plate is only dirty where the food was, I avoid getting my first and the location around my mouth dirty... Most of the people that I've met so far doesn't seem to mind it at all. The ISTJs seem to mind it - some of it they avoid, some of it they clean instantly, some of it they don't mind. (that goes as far as cooking and eating, don't apply this to other activities )
I'm not sure what function(s) my actions may reflect...