I think I have mine sussed.... I get the teenagers to do their own (three away at the moment, so no problem there at the moment!) and I do dh's and mine and the two little ones.
I have two washing machines and two tumble driers and a line (spoilt, I know!). I do as Cod does - washing overnight, but I tend to do two loads. If it is wet I then split each load into two and tumble - if I put a whole washing machine load into one tumble drier, it takes forever to dry and comes out v creased. Tumbling half a load is the secret. If it is dry or sunny or windy I put everything out on the line first thing in the morning. I tend to do one load clothes and one other stuff (towels, swimming stuff, sheets etc).
I use the very wonderful Ariel cold which washes at cold so stuff doesn't run - is much cheaper as machine doesn't heat up water - and I chuck in one of those colour catcher sheets into each wash, I use and use them till they are navyish. I almost never have any problems with colours running or grey whites. I spray with vanish any stains as stuff goes in the basket. I do bras and woollens separately and once a week I do a warm or hot wash with anything either very dirty or stained.
I fold and put away every wash as I go, if it piles up it becomes a heaving nightmare very quickly. I have a cupboard with an ironing basket in and I put the ironing in there for the weekend.
I iron on Sunday evenings in front of the tv. I am sad enough to actually feel itchy if we go out or have people over and I miss my ironing session.
I make the kids put theirs away and check the laundry basket to make sure they have not just slung stuff back in clean. I also make sure that they put stuff away properly in their cupboards .
I used to have an alcoholic ironing lady who smoked like a chimmney and would teeter over with bags of my immaculately ironed clothes - which never ever smelled of smoke. Local rumour has it that it is her mum who actually does the ironing (bloody well). After the holidays I will reluctantly relinquish my ironing evening and hand over a week's ironing to her on Fridays.
My ex husband once mistakenly criticised my washing/ironing system (bastard) and I went on washing strike. I washed stuff (couldn't leave it to fester) and then piled it up, wash after wash on the dining table. I kept school uniform (only !) pristine. He lasted a couple of weeks on this system.......