Imagine we evolved on a planet with only enough land for 10,000 people. We would never have most of this stuff because people's work would not be specialized enough to get us there. One person would be responsible for so many different things that they wouldn't go into depth on each one. For example, maybe we'd have a library, but one person would be responsible for both printing the books and running the circulation desk. We would have technology (someone would have invented, say, a wood stove), but we wouldn't have anywhere near as much of it.
But instead, we have billions of people now, and it was at least 2000 years ago that we reached 100 million. When you have that many people, although most of them are still working on the basics (growing food, building housing, etc.), in absolute terms there can be millions of people working on specialized tasks.
It also makes me realize how prosperous we are as a species. Although we haven't eliminated poverty and hunger (and should and probably could), as a species, we are far from being on the edge of survival. We have enough resources that we have people working on niche stuff that will pay off in the future if ever. We have projects that require hundreds or thousands of person-years (in other words, equivalent to multiple lifetimes) of work, and the end result of the project is (say) yet another action movie or romcom.
Humans are smart and creative, but the reason we have what we do is lots and lots of people over a very long period of time with way more resources than what we need for subsistence. Which is pretty cool because any of those things could have not happened, but they all did.