sorry havne't read thread.
food shopping: i do it during the week, in the evening if necessary, but pref in the last 15 mins before work. markets, corner shops etc much quicker than big supermarkets.
"chore" shopping for children's gifts: same: develop a few standby gifts or focus on one shop where you get to know the stock well -for me it's books, so I know what they have or ring them to order in what I want and pick it up v quickly.
maybe go out together for a walk or some other activity - atm ds is small so we tend to leave proper walks for when it's just dh and me, but we wander to the park/ducks for an hour or so before supper.
Sunday lunch - if a roast, it takes 10 mins to slam it in - don't do loads of complex stuff with it - do baked pots not roasties and do roast veg so you just chuck them round the joint. if still a prob, make Friday night supper your big meal and eat leftovers during the weekend
go to church - if you are at all religious then try reinstating a Sabbath. You just aren't allowed to shop or do housework that day. All of a sudden, loads of time to relax (too much sometimes, can be quite dull, you get keen to do stuff like teach religion school cos it's less dull) and the rest of the stuff does get done somehow.
Office/domestic stuff - i bet you're organised at work - get one In, Pending, Filing set of trays, keep writing paper envelopes and stamps in it and go through it once a week. Chuck out catalogues etc that 'might come in handy' - either buy something now or bin it.