Astro's Playroom was the first game on PS5 that floored me with its demonstration of the Dualsense. I would also say Returnal utilizes the controller incredibly well from the couple of hours I've played. Load times have also been incredibly quick this generation.
Overall, there were moments in Rift Apart, Final Fantasy 16, and SpiderMan 2 that gave me that next generation feeling. I feel like traversal has taken a massive step up compared to the PS4 as well. I think back on the flying of Gravity Rush 2, and even HFW, that felt clunky and cumbersome, compared to the freedom and speed with the flying in SpiderMan 2.