Lithium polymer batteries that make advanced computing portable. We wouldn't be able to create multi function cell phones without the battery power and longevity of those batteries. Star trek tricorders are going to be the next big tech coming to the generation after Gen z.
If you lived in a society that had ready access to replicators and holodecks, you'd probably be asking for teleportation and eternal youth.
What's amazing yesterday is boring today. That's kinda part of the human condition.
Being able to fly anywhere in the world with almost zero planning, and then being able to communicate back to anyone at home with almost zero delay, would have been unheard of just two generations ago, but now that it's normal, it's a shrug and look for the next thing.
If you've got replicators, you already have half of a teleporter, and you already have the technology necessary to fabricate replacements for failing body parts, so you're already at least partway to teleportation and eternal youth.