We have had gay marriage in Canada since 2005. While I don't like it, I can honestly say it has never affected me in any way, shape or form.
Our legislation was also a result of constant court battles in every province over gay marriages that had been performed. Only Alberta's premier fought back, and the federal law overruled him in 2005.
https://en.m.wikipedia.org/wiki/Same-sex_marriage_in_Canada
One thing the Act does include, which is maybe why gay marriage is not such a big deal, is that no minister shall be forced to perform a marriage which is against their religious beliefs. So Christians are all protected from having to have gay marriage in their church.
I also find it quite amusing that people think the pope is going to allow gay marriage, because of the decision in the US. The Catholic Church is a huge institution, with more members in conservative countries in South America, Africa, etc. The RCC is not going to change its standards just because one country changes its law. For what it is worth.