Oh man...The early Harry Potter games. Let's all take a moment to remember how freakin' awesome Chamber of Secrets was...The first game I can remember playing was Excite Bike for NES sometime around 1995 or 1996. We got the console from my aunt's family after their oldest kids had grown tired of it. God I loved that game so much, and that was in 8-bit! But during that same period I saw one of my dad's friends playing the first Tomb Raider which was completely in 3D, so I was exposed to the modern era quite simultaneously.
Another factor that played a role was the fact that I was a PC gamer as a kid, and I didn't buy my very own video game console until 2004 with the PS2. On my computer I played a lot of isometric 2D games like Roller Coaster Tycoon, SimCity 3000, The Sims, etc. But I also got to play 3D games like Theme Park World, Half-Life, Rune, and the early Harry Potter games.