It seems it is, I'm Dutch and also don't recognise this at all (but not married yet, so who knows). It does remind me, again, how many HN and Reddit discussions so often are by default seem US-centric, until stated otherwise. I am very much willing to accept though that the fact that this annoys me a bit is my own problem.

I believe it is more of an English speaking world thing. The tropes of the white wedding come from people emulating English nobility.

https://en.wikipedia.org/wiki/White_wedding

Yes it is American. Getting down on your knees to propose, the engagement ring, the bachelor/ette party, the white wedding dress, the bridesmaids in matching outfits and flowers, the handwritten invitation cards, the tiered wedding cake, the wedding photographer, the reception dinner. It's the cultural script that little girls and boys learn to follow. .

It's more of a white people that watch movies thing I think. So yeah mostly American but you see pockets of it on different cultures, one of the common threads that I find is that people that like this also like their houses to look as if they were designed for the set of a romantic comedy.

It’s an American consumer culture thing.

Yep, to a large degree, at least. American thinking is thoroughly colonized by powerful corporations. In the absence of a real culture, you are left with consumerist zombies. So when Washington comes knocking at your door to "liberate you" and "spread freedom", just know that this is a large part of what they mean.