I understand the feeling completely. I loved my big family Christmases as a kid.
Now though I can only give my child that some years, and on those where we are by ourselves, it does feel like something is missing, or I'm not giving him what I had.
But then again, I look back on my Childhood, and I don't think I "Loved" that there were loads of people there. I loved Christmas - the fact that there were a lot of people didn't really make it better or worse overall.
Now that I have done both with my son, I can certainly see that each has its charm. This year will be a "lot of people" year, and it will be manic and exciting and busy... but I guarantee you that I'll spend most of the festival wishing I could have just a bit more time to actually play and do things with my son, I already know that he is just going to want to build his Lego (Lego crazy this year) with me, and play imaginary stories and battles with it.. and that is going to be hard to do in rooms filled with people/TV/actives..
Equally though, other quieter years, like next year.. I'll have tons of time with my son, but I'll sit there missing the busy noisy atmosphere of a house full of people, and how sometimes it just feels too similar to any old normal night, without other people there.
The grass is always greener - Just make the most of it, and I'm sure your children will have a lovely Christmas.