Two years ago DH told me I should be glad he was interested when he was telling me I was trying to buy the wrong kind of Christmas tree (he has opinions on fir vs spruce apparently,and has always wanted us to get an artificial one). We then came home to put it up and he buggered off into the spare room not to be seen again. That was the most interest he had ever shown.
Last year we had a colicky and refluxy newborn. I think Christmas happened about week nine.
This year I capitulated on the tree issue and agreed we should get an artificial one. We went and looked around the shops as Tesco have their voucher exchange on and thought we could probably get one there. He took one look, looked like a sad puppy, turned to me and said "Shall we get a real one?" I think having DS has made him see things differently, he loved his birthday even though I wrapped the big present which he wouldn't have done and watching him get excited about it all.
His family are like a PP's and do Christmas under sufferance. They have a tiny tree, which is hidden behind the TV, the decorations go up about the 22nd and come down New Year's Day and it's awkward as sin on Christmas morning. They all get up and washed and dressed and sit around the dining table. The first year I spent with them I had no idea and wandered down to the living room (always beautifully deocrated, open fire etc) in my PJs expecting a bacon roll to find them all sipping tea round the table.
They also view me having a glass of wine after dinner as decadent in the extreme and want to play board games all evening. Which is fine, I'm all for a bit of Triv from time to time, but if BIL or MIL loses then we have sulks til Hogmanay, so I can see why he doesn't see it as exciting or magical really.
He is very good at choosing presents, but I have to remind him weekly from mid-November to pick something up for the ILs and one or two of his friends. I do the rest as I actually enjoy present buying and being a SAHM have more time to do it.