I don't think i'll ever get the same joy and amazement out of a game as I did when I built my first PC then loaded up HL2. I was just utterly blown away by it after coming from the PS2. I think it was also the fact it was working on a pile of parts I had put together.
I also get the same nostalgia when looking back at games I played when I first got my PS1, like Resident Evil, Silent Hill, Tomb Raider and Broken Sword. This was a time when I had to save for a game and then played that game to completion, rather than playing 10 mins to test it runs well and then leaving it for months like I do now. Plus before this I had mainly played platformers on the Snes and suddenly realised games could have a story and character development and not just collecting rings or coins.
I think games just don't evolve as much any more compared to how they did years ago. Going from the Snes and megadrive or whatever to the PS1 was a massive jump in gfx and gameplay. Then again the PS2 was another big step up in gfx. Lots of great new IPs started from the PS1 onwards, so there was so much new content to discover. These days it seems like its mainly sequels, HD remasters and reboots, with very little in the way of exciting new Ips.