I have always been quite organised but now I have two kids and a busy job I've had to take it to a whole new level. A few things that work for me are:
Online food shop - don't waste time in supermarkets. I sit down on the sofa once a week (usually Weds) and plan things you'll cook next week (use recipe books to help - I'm loving one called the Green Roasting Tin at the moment which has lots of simple, tasty meals). I get food for the week delivered on a Friday. Then we've got some nice food for the weekend and the rest is ready for the week. I cook enough to have leftovers to take for lunch the next day.
Evening showers. I used to always wash my hair in the morning but it was making mornings such a rush so now I have a quick shower while the kids are in the bath or playing and then my hair dries itself before I go to bed. Quick run over with the straighteners in the morning and it's done.
Exercise - I invested in a spinning bike (few hundred quid from eBay) and do 20 mins while watching the ipad either before the kids wake up or when they're watching tv. Also bought a £4.99 kettlebell from Aldi this week and did a 20-min workout following a routine I found online.
Lots of lists. When i think of something that needs doing, or that I need to remember, I write it in the notes app on my phone. Then I don't have the mental clutter of worrying whether I'll forget it. So there's lists on my phone that say things like 'Monday - check kids nursery bags, post letter, buy birthday card, put wash on' - that kind of thing.
Clothes. On Sundays I'll plan what I'll wear to work each day and write it on my weekly calendar or in my Notes app. I then iron anything that will need ironing so I'm not rushing round doing it before work.
Admin. If you can do it within a few minutes, do it immediately so stuff doesn't pile up. Once a week, spend a bit of time on anything that takes longer.
Like others have said, multi-task when you can. File nails or wipe the sink while the kids are in the bath, pack bags for the next day while the dinner is cooking etc.
Also as others have said, sort out odd bits around the house in small bouts, rather than seeing it as one overwhelming task. Sort out a cupboard or drawer every few days and once you've got it organised try and keep it that way. Put things back when you've used them and check before you leave a room whether there's anything there that doesn't belong there.
Sound a lot but once you get into the habit life does get easier and feels more manageable.