I agree! ;W; Maybe Kanon was not as emotionally heavy as the anime that followed (after all, it was the first visual novel Key made)... the only story that made me cry was Makoto's (and also Sayuri's flashback, for some reason). The first Key anime I watched was Air, which left me positively traumatized ;W;
Then came Clannad After Story... which I still regard as one of my favorite anime EVER
Pfft, I guess it indeed would xD