You haven't noticed a difference in graphics since 2005? mkay... try playing a game that wasn't released in 2005.
I played Doom 2016, Zelda BotW, and Mario Odyssey.
Doom 2016 vs 2004's Quake 4 didn't seem like much change. The biggest difference with Zelda and Mario is that prior entries weren't in HD... the prior games basically used pre-2005 technology.
The biggest leap I can think of is Portal vs Portal 2, but that's all just a style/budget choice. Portal was an experimental game with very basic graphics while Portal 2 was a full fledged game making the most of the engine's capabilities.
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Instead of running Half Life 2 on a potato, turn the graphics settings up. Instead of picking a sterile urban environment, lets see what the forests of Episode 2 look like.