I don't think all of beethovens sonatas are overplayed. I you think of it, there's alot of sonatas you've never even heard. And as the appassionata no longer is so popular, I would say Mondschein and Pathetique are the most overplayed. And of course Für Elise...
Chopin: Minute-Waltz, and the one coming after, the famous Polonaises(Ab and A), Revolutionary Etude, Raindrop Prelude(!!).. and Pherhaps the Ballad in Gm.
Mozart: Sonata in C, and the third mvt from Sonata in A(Rondo alla Turca)
There are alot more, for instance by Bach(Prelude in C(!!!), Cm, D, B, ++ WTC book1). The reason why they all are murdered, so to speak, i think is because they're all so beautiful that everyone plays them, and plays them too early. They are often keys of motivation for young pianists. You should'nt avoid playing them, just make sure you play them well and not murder them like all others.
And Taht Sepinlplg Tinhg Was Rteahr Cool As Wlel