My nostalgia moments reach further than the Amiga era. I can get sentimental over Sega Megadrive/Genesis games, PSX, PS2 and early 360 games. IMHO nostalgia grows over time. Though later in time nostalgia will be less strong probably, with the period of our youth always being the strongest.
On top of that, we should not forget that we witnessed the start of a new era, with just as much or even more impact than the industrial revolution. And the Amiga, for me, took center stage