The TI 73 through 86 models of graphing calculator all use z80 CPUs, and the 83+ was probably the dominant school calculator well into the 2000s. That was my introduction to the CPU (hobbyist programming, e.g. through websites like ticalc.org).

On US school system and similar countries that impose specific brands on school kids.

On my days it was all about Casio and HP, with TI on third place.

I had a TI-85, which was my introduction back in the mid 90's. Still love the Z80.

There's also the Gameboy, which still has an active homebrew scene

Yes, although the GBZ80 is distinct from the regular Z80 in several ways -- among other differences, it has no IX or IY registers, and no alternate register bank.

It really shouldn't be called the GBZ80, it's a Sharp SM83

It was only a couple of weeks ago that I posted about writing a text-based adventure-game in Z80 assembly language, to run on a single-board CP/M system:

https://news.ycombinator.com/item?id=26946130

Some of my fondness memories are typing in programs from 101 Basic Computer games on a ZX81. That and Beagle Bros ads and their mysterious peeks and pokes.

My dad and I built our computer from a kit ... which of course failed. Turns out 1/3rd of them did so and we received a prebuilt one.