I suspect whether the children cope with Not Being In Their Own House All Of Christmas Day is highly dependent on how their parents feel about it.
When I was little we would open our stockings in my sister's bedroom and our Pile of Presents downstairs in the lounge. Possibly while my parents recovered from the late night and had a cup of tea, certainly without their direct involvement. Then we'd have breakfast (pork pie) and then go off to church, leaving all except maybe one small example of our fascinating new toys at home. Then we'd go to granny's for lunchtime dinner, again leaving most of the toys at home. Great-Uncle George was the one who gave my new doll her name (I suspect all the adults were horrified that I'd used the name on the box, Poppet
). Far from being desperate to get back to the new toys, there was always one of us who stayed overnight when everyone else went home.
Other granny (both were widowed by this point) would babysit on Christmas Eve and often come with us to local Boxing Day Walk Place.
This only stopped when my grandmother had a stroke, when I was 14. We started staying at home for dinner and having presents in the afternoon, the morning being taken up with two different churches' bells and music requirements. Then some of us would go to my aunt's for tea and daddy would break one of her Royal Doulton teacups washing up.
When H and I married we alternated Christmas / NY visiting parents for several years (Midlands and Essex, us living in the north). When S2 was a baby we felt that being away from home so long was getting too much for S1 so started travelling south on Boxing Day. My dad didn't want to travel by that point but H's parents came up alternate years. This did mean that we were around to sing on Christmas morning - and to ring, in a different church, when timings allowed.
I admit that for a couple of years S2 declined to ring on the grounds that he wanted to stay at home... but he was a teenager by then. At 15-16 he didn't seem to mind being at his granny's over Christmas.