As a child I was absolutely floored when I found out that monarchies

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As a child I was absolutely floored when I found out that monarchies still exist and that there are still kings and princes in the world. But monarchies were still extremely common right up to the early 1900s, people fought against oppressive, hereditary regimes to install democracy and republicanism in their countries, veterans of these conflicts, and the nobles and royals they fought against, might have still been alive in the 1970s and 80s, only ten years before I was born. Yet by this time the world had seemingly already forgotten about monarchy, it was already seen as some ancient form of government and not something that had only been (mostly) extinguished following first World War, still less than a hundred years prior.

Why do you guys think it took so little time for humanity to not only get over monarchy, but to romanticize it to the point we do today? I'm only coming up with Disney influence, which I'm pretty sure was important, but could not have acted alone to bring forth such a massive change in the way of thought, so what did it act in concert with?