Dude, Peter is forever a nerd
What he didn't become in Spider-Man 2 is more confident, gutsy, and socialize
In the comics Peter is always a nerd, he fell in love with another nerd, Gwen Stacy, even the new movie show her for what she is, a nerd, even if she's not shown reading books, she is a nerd, it makes her the perfect match for nerd Peter Parker
A nerd is well informed and very attached to a certain topic/thing, Peter is a science nerd, growing out of it isn't development, it only deprives him and us of one of Spider-Man's best qualities, a science nerd
What are comic nerds? People attached to their thing, to comics, if it's good development to stop being a nerd, then maybe I should stop reading comics, cause I am a comic nerd, and I enjoy it
He should socialize more, be less of a shy self withdrawn character, but he will remain a nerd, cause that is what he is in the comics, that quality helped him develop and improve his webbing, cure Lizard and his 4 extra arms condition, enter the Think Tank in Horizon Labs, work with Tony Stark and every genius in the Marvel Universe