There are advantages and disadvantages.
Christmas is always full of visitors and strangers. So you may meet people, but that doesn't mean they will be there next week.
Equally many regulars will be away, so it will not be a 'normal' Sunday in terms of who is attending. Also, we usually have tea and coffee after church, but not at Christmas because people are running home to rescue the turkey or to be with the family.
I know we try to to put on a big effort at Christmas to make everything look and feel fantastic, becuse its a special occasion. However half the people who usually do things are away. I'm trying to prepare music and singing, for example, but only 3 out of 10 choir members will be there on Christmas morning and 5 for midnight Mass (the same 3 and 2 others).
A few years ago we had all our best singers, (people home from university etc) and sounded so fab that many visitors wanted to come back. This year will be shit.
So don't take what you see at Christmas to necessarily the norm, either way.
Taking all these things into account, I would say come, try it. You can be far more anonymous than a normal Sunday, but equally remember this is not how it usually is.
Also, whenever you come, remember most people are shy, and a lot of church goers seen to be introverts. So don't expect people to talk to you much at first, unless you make it clear you want to be spoken to.
Even for the most social of people it is hard to talk to a complete stranger when they give you no cues to work with.
Wherever you go, I hope it goes well.