I do not enjoy it at all.
It is one of those days where you are forced to sit around and smile like creepy demon clowns, despite the fact that every single one of you can feel the rising pressure of frustration and contempt building up and filling the house like some sort of dark, shadowy cement.
There will always be one weak, pathetic creature who cannot handle it (usually my sister, in my house) who will explode and allow the whole of it to flow right through them.
Meanwhile, everyone else - including the target of the flow - will smile, their creepily cheery grins becoming more strained by the second, and try to convince the avatar of the slowly ebbing pressure to calm down while simultaniously making passive-aggressive comments, until finally someone else has enough and begins to raise their voice.
Soon after, once everyone has had their fill of shouting (Except for me, that is. I tend to leave it at one contemptual comment on the complete void of intelligence in the house before vacating the room), you all sit down, embarrassed and suddenly reluctant to make any noise, and pretend to enjoy your dessert like civilised people.
The only other days like this are birthdays.
But on birthdays, you only have to be nice to one person, so the pressure is less likely to build to the point that some idiot willingly becomes its avatar.
Of course, I might be projecting a little.
I always sort of assumed everyone's Chrismas was like this.
Everyone I ask claims it is.