OOT made me a fan of games. Wind Waker made me a fan of Zelda. Both those games hit me so hard. I remember seeing Wind Waker screenshots in a magazine for the first time and I couldn't wait to play it. I played Majoras Mask before WW but MM didn't hit me until much later. OOT and WW will most likely always be my favorite Zeldas.
OOTs Forest Temple is my favorite Zelda dungeon. Zarama The Dragon God is the one above all.