I know someone with 8 brothers and sisters and they confirm that the oldest definitely had more effort put into raising them. They had way more pictures taken of them growing up than the youngest did.

And it's just how it goes with anything. The first time you drove a car I'll bet it was extremely exciting and you had butterflies in your stomach and everything. Now you get in your car and it's just meh, you may even dread having to commute. Same with drugs. Same with living on your own for the first time vs the 1000th day. Same with the first time you had sex compared to the last time you had sex. Same with your first date with someone vs the 50th date.

It's just a fact of life that the more you do something the less unique or special it is.