Outside of the very first storyline, which covered the origin story, every arc since the first six issues were brand new stories. Spidey taking down the Kingpin, revealing his ID to MJ, Gwen Stacey's new personality, dealing with Venom which was a creation of his father's, dealing with Carnage which was his biological clone. And these are just off the top of my head. None of these stories were anything that Stan Lee did during his tenure on the book.
I mean, a modern day "Stan Lee?" No, not in the slightest. But he didn't simply "rehash old Stan Lee stories."