We don't include Santa, because, well, we just don't.
Christmas is still wonderful and amazing and magical and special and it's focus for us is family, which I feel, for us, is enhanced without the rest of the shenanigans. We also, as a non-religious household, still tell the story of Saint Nicholas, just not the modern, commercialised version of Santa.
It works for us, our children have *never* gone on to "spoil" things for other children, either. We remind them every year that each family is different in their celebrations, and that some children believe that Santa is real and that he is the one that brings them presents, and it is not their place to say otherwise. And they never have. They have *lots* of young cousins who all include Santa, and our combined Christmases have always been amazing.
If you don't think Santa is for your family, then you don't have to include him if you don't want to, and your children won't feel as though they are missing out - at least, my 4 certainly don't