My first was probably in the late 80's, where moving from the schools BBC Micro's to a Spectrum 48k, to a Spectrum 128k, to a Commodore 64 and then Amiga 500, all bought with them an excited, innocent, wonderment - before the dark times - before all the people became experts and learned how to be offended by polygons, physics and frame rates.
My most recent was probably RDR2, though I suspect that was just an echo of the appreciation of how incredible open world games have become.
There's been a few wow moments in between too.