If you've been a gamer for any length of time, your backlog is probably immense...
I have all of the Tomb Riaders, Bioshocks, Deus Ex games, POE, countless racers, Batman, nearly all the Yakuza games etc etc many from PS+
Then you have things like PS+ collection for free basically.
These along with Destiny and other online perpetual games are what you play between main releases usually.
But the juice is the big titles.... GOW, Horizon, Spider-man, R&C, Elden Ring, GT7, Forza, Ghost of Tsushima, Battlefield 2042, RDR2, Persona, Final Fantasy etc.
For me, a sub service is for people who are new to gaming or for some reason do not have a backlog.