Christianity and Roman Catholicism. There is a difference.
The Incarnation is the one glorious reason why she's honored, and given to His disciples as well: Son, behold your mother.
Refusing her honor is refusing the one Christ honored, for He perfectly kept all the Commandments to a supreme and sovereign degree, including "Honor thy Father and thy Mother."
"He who is mighty has done great things for me." That's what we honor.