Having the big huge climax of the movie be with Frodo and Sam, instead of with Aragorn et al. would have also reminded the viewers that the real quest is with Frodo, and that all that Aragorn is doing is being...
Legolas: A diversion!
Me: Yes, Lego, *pats his golden head* now go away.
Phillipa Boyens talks on the extras of the DVD about how you can't be so emotionally demanding on your audience, to have them sit through Helm's Deep and then have to go face Shelob too. But by moving Shelob to RotK, they do the same thing. You're all emotionally drained from Shelob, then go through all the Pelennor Fields, and when that climactic battle is final over, you think you can relax, but no, the next scene brings you back to Frodo, the one who's really important, who is still stuck in Cirith Ungol.
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