I put away savings all year for Christmas and presents, and I keep a spreadsheet for what I buy to keep track of bargains I find early in the year that suit the recipient.
In previous years, I have always prepped everything on Christmas Eve - peeled potatoes and veg, made stuffing, prepped my herb butter for under the skin of the turkey, that kind of thing. This year, it was only 3 of us and I did it as I got things in the oven - but I only did 1 veg and SH was disappointed there was no cauliflower cheese...
Christmas Eve dinner is "platter" - open packets of cooked/cured meats, prawns, cheese, etc, decant onto plates and put in the middle of the table. No fuss but deliciousness.
In our house, Santa never wrapped anything - just left anything from him beside the stocking in the middle of the room. Anything from other people was wrapped and under the tree to open later. (We have a 19 year old now so no need to differentiate anymore).
Also, Santa always brought a book as part of the pile, and some fruit and sweets - which kept DD from starving while we organised breakfast.
The years that I do craft presents, (as I enjoy crafting and have a lot of presents to get), I batch it. So one year, everyone got cotton knitted facecloths but each had their own initial on them and a soap matching their personality. Another year was a variety of different scarves. Another year, as we were doing a Siblings stockings thing, I made 15 stockings (which were supposed to stay in DParent's house but there's only 1 left there now). And there have been a few years where I did batches of jam, mincemeat, limoncello and chocolates as part of hampers for a few people (not all at once).