Okay, so I love Christmas and have no 'just cut back' tips (though I definitely should)! But here's some bits I've started to do since having DS that's proved really useful - not for everyone though 😂
I make a list just after Christmas every year of people I'll need to give gifts to the following year in the notes tab of my phone. It's normally a bit fresher that way as you'll remember anyone you forgot until the last minute etc. You can obviously add to it if you think of someone/cut someone out if you need to along the way. Then throughout the year if I think of something/see something I know they'll love I add the link to the tab.
Order everything in mid-November/Black Friday. If you've thought of something for the person, great. If not, gift card. You can always jazz up the gift card (I like doing Cineworld gift card + couple bags of popcorn + magic stars = family day out!) but don't spend ages looking for the right gift.
Buy a load of gift bags. When all your packages arrive, set aside a few hours to go through them all, empty them into the bags, and write names on the tags. Much faster in bulk than doing it one at a time. Group the gifts by coloured gift bags depending on when you see everyone - so if you're seeing Sister/BIL/Niece/Nephew together, put all their gifts in snowflake bags, so you know to grab all of that pattern when running out the door (this may be OTT but I'm pretty visual and it works for me!)
In terms of time - I wait til the beginning of December and everything important is in the calendar, and then I block out 'home time' - at least 1/2 a day every weekend and one evening a week, where we'll say no to any plans and spend time at home. Christmas at home should be magical too, and you don't want any home memories being of burnt out moments between activities!
Household tasks, it's obviously dependent on budget but I try to eat out a fair amount in December so there's less washing up (even things like grabbing Christmas meal deals on the way home and having a car picnic rather than eating when we get in). Something I find helps massively is when the tree goes up, it goes in the corner where DS normally has his toys - so he knows they all go up to his room bar 1 basketful. So much less daily tidying!