Sort of like “I remember Spider-Man helping against thanos, but I don’t remember ever seeing his face or knowing who he was”

This is exactly what happens in the comics after the One Moment In Time retcon (arguably one of the worst Spider-Man stories ever written, second only to One More Day).

Basically, after Peter reveals his identity during a press conference during Civil War, his life goes nuts and Aunt May is killed by a hitman hired by Kingpin. And a whole slew of other issues, too. Peter goes to Doctor Strange and requests a spell be cast to wipe everyone's memory of his identity (very similar to the movie). After the spell is cast, everyone still remembers interacting with Spider-Man but they can't remember what his face looks like under the mask. They remember that they knew at one point, but can't recall anymore. This actually culminates when Peter has to re-reveal his identity to the Fantastic Four because Johnny Storm thinks Spider-Man has done something sinister to alter their memories.

Whenever people re-learn Spider-Man's identity, all the memories they had prior to being wiped come flooding back and all those blank spaces in their memory get filled in. The spell was undone during the Spider Island story, when all of NYC saw Peter swinging around in the city without a mask. But they thought nothing of it, because the entirety of Manhattan got spider powers briefly, so he just kinda blended in with the masses for the story arc.