I have never even been inside the Lizard Temple. I've never beat Skeletron Prime or The Twins legitimately. I have fought Plantera, but I wasn't ready. I was like, "I wonder what this pink thing is," and then died because I wasn't ready. I haven't gotten all of the NPCs either. I've never fought the Frost Legion, Eclipse things, or the Pumpkin Moon. I feel like the game should be over after I beat the WoF, and I won't normally play after I get to Hardmode.
Oh yeah. I have made a small minecart track which was rigged with fireworks to go off like in Donkey Kong Country 2, but I stopped making it soon thereafter and never made a huge minecart track. Also, I've never wired 2 teleporters together or made any Skyware or Crimson furniture.