The radiation chamber scene was not a retread. It was a visual juxtaposition--something common in art.
If it was a retread, Kirk and Spock would have been properly placed in their previous roles. However, Abrams intentionally
switched them around as a visual cue to nuTrek's main theme.
People argue that JJ-Trek is vapid and void of substance, but when he goes and does something rather substantive, the same people dismiss it as cheap and unoriginal.
The guy just can't win.