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.
Best succinct explanation I've come across. Well said.