Honestly? I thought it would be in the details of the worlds they made. The progression from early shooters to full 3D ones in 1998 created a perception that there was no aspect of the real world that they could not mimic, and make it fully interactive; a world full of real-world features. That was the idea.
Games today are more shallow than they were in 1998 though, big surprise and big let down for me.
I spent a lot of time building Doom maps, editing WAD files, spent a lot of time in Duke 3D's Build Editor. The idea of tagging sectors to give them a specific, preset function, which you could tweak with modifier tags, and stack other tags on top for multiple functions... was genius. This was what gaming in the 90s was about- making feature-rich environments using clever tricks and ingenuity.
It's pretty god damn sad that now that we do have full 3D tech and models without pointy polygon heads that everything else is completely uninspired.
Also in 1998, I predicted global terrorism would destabilize the entire middle east in response to provocation from groups like al Qaeda who could hop from country to country; and that the USA would tear the entire middle east down chasing them... basically starting WWIII.
I spent my entire teen years preparing for war and the apocalypse. Now that I'm 30, own a home, have a gf who lives with me that I will probably marry, I don't really know how to feel. I honestly didn't think we'd still be here in any meaningful capacity. And not to trivialize the events of 09/11/01, but when I turned on my TV that morning I was secretly excited because this was the beginning of my whole vision. I turned on TV that morning and I knew exactly who the finger would be pointed at, and knew exactly what came next.
To this day, I do not understand how we did not start WW3. Maybe we still are, maybe it's just taking longer than I thought. Now i'll be too old to be of any use.
A little off topic, but I genuinely did just go back in time 14 years just now and thought about just how I felt. So thanks for that.