I call Spaceship Earth the "ball" and I've been going for 15 years.
My sister called Splash Mountain, Splashy Mountain for the longest time. Of course, she was 4 so we just laughed at her.
I've heard "Fast Track." My biggest peeve is people calling Magic Kingdom "Disney World." I've heard so many, probably weekly, that it's hard to remember them all. I'm going to start writing them down.