The post credits scene is totally skippable for someone like me who is, at best, a casual / occasional MCU enjoyer. (I get that it's a hint to something but I don't know enough to care about what it specifically is.)
I thought I was still a fairly involved MCU fan, but I still had to have my brother explain the post credits scene to me. (I mean, I got that it was Ned's app, but I didn't get the significance of the Spider-Man icon being in space. My brother says it's because Spidey is on the Fantastic Four's ship with them. Though I also don't get how that's going to happen. I just overall feel like I am Not Getting It.)
Anyway, though, yes, the movie was delightful! I really wasn't sure how the Punisher would work in a Spider-Man movie, but it turns out the answer is: very well!
I didn't guess ahead of time what character Sadie Sink was playing, but the reveal did make me say "Holy SHIT!!!" at full volume in a packed theater. So well done Marvel, I guess.
I am tickled pink by Ned remembering Peter through the power of friendship (and maybe the suppressed Dr. Strange-like sorcerer powers from the previous movie?).