This isn't a shallow celebration, but in Catholicism something of much deeper significance (like a lot of Catholic stuff lol!) if you turn into into a shallow, 'I'll just shake hands with people I know,' or 'I won't shake hands or even look at that bitchy woman,' or even worse, 'I don't even know that person so why would I want to shake hands?' then it really has no significance whatsoever. It should be quick, simple and sincere.
I get the feeling in some churches it has become much more of social, not spiritually significant, ritual you can take or leave- so probably has little meaning anyway.