This may bother many but when we were first trying to tell my then 2 year old neice we were going to Florida to see Mickey in 2003, we called WDW "Mickey's house". She had just began to understand that aunt and uncle had their own house and so calling WDW "Mickey's house" seemed okay and understood by her. Today, we still sometimes refer to WDW as "Mickey's house" when we tell my brother's young ones that one day they too will get to go.
The monorail = ma-morail. Got name in 2003 by neice. No matter how many times we tried, she kept saying "Ma-morail". To this day, we tease her about it. Luckily, she has a great sense of humor and doesn't let it bother her as much as the Chocolate milk incident (a whole 'nother story).
BTMRR = The "bumpy" ride. Got the name in 2005, when same neice, now 5, rode it for the first time, turned to her uncle as we were going up 1st hill and asked, "Does this ride have bumps?". Thinking she was refering to bumps as bouncing as if going over speed bumps, he told her no. So as we get off the ride, she started crying, and when asked what was wrong, she turned and pointed to her uncle and said, "Uncle gabe lied, there were too BUMPS!". Apparently she meant did it go up and down hills fast. She did ride the ride again a couple days later, wanting to ride the "bumpy" ride. Took papa on it last year at age 7.