Consider me a recent 120fps convert.
Finally got my gaming PC this year (after being console only for almost two decades) along with my C9 OLED. And basically, holy shit.
At 120hz there is ZERO motion blur (like the old CRT days but without the flicker) and it feels so damn responsive it's ridiculous.
2D platformers are a night and day improvement over 60fps at 120fps. Firstly, because there is no motion blur it means the beautiful art of Hollow Knight or The Messenger remain totally pristine in motion. Switching back to 60fps and everything looks so muddy in comparison; it's amazing how quickly you get used to 120. And secondly, the input latency is so much lower it makes twitch platformers an absolute bliss to play.
Unfortunately the C9 only currently supports a maximum of 1440p at 120hz though, albeit there is a firmware update later this year to HDMI 2.1 which will provide 120hz at full native 4k on the glorious OLED screen.