Interesting you should mention the finding of the horcruxes, here is where my theory comes in....

Harry is sitting silently brooding (as he so often does, expect him to yell at Ron and Hermione if the talk to loudly anytime soon) Suddenly a small lightbulb appears above his head, that's right folks Harry Potter has had an idea. Now since all Harry's ideas work out so well (i.e. he got Dumbledore fired, Sirius killed, etc.) he instantly decides to try out this new idea.

Harry stands up, draws his wand and in a loud voice yells....

ACCIO HORCRUXES!!!

Several minutes later Harry, along with the rest of the DA are foolishly off to confront a group of much older, more experienced wizards who can kill with a single word, the Deatheaters
Nonetheless the brave group attack these wizards and their leader (Voldemort) whose magical prowess managed to hold the entire wizarding community at bay for years. After a brief battle, muh dialogue, and a few of Harry's friends dying (luckily Harry must be getting used to this) he manages to defeat Voldemort and there is much rejoicing. All that remains now is for Rowling to write a fifty page epilogue explaining all the inconsistencies in her previous books.

DISCLAIMER i am a fan of Harry Potter, and do enjoy the books, I merely feel that the characters are often too predictable and several times they never consider the easy option, because that wouldn't be much of a story now would it?
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okay, as far as harry yelling ACCIO HORCRUXES, in book 6, he tries to do that with the locket in the basin, but it doesn't work. Instead, that inferi thingy jumps up out of the water. (Even though that wasn't the real horcrux there. But, seriously, there was an enchantment so that no one could just ACCIO whatever was in that basin out of there.)