Yup. The information on file of what ride you were at what exact time. When and where you ate each meal. What you bought at the gift shops and when. What time you opened the door of your hotel room. Nearly everything, definitely far more than I listed above.
It's creepy to think about, you're certainly right. With the wrong person in charge, I can only shudder at the thought of what evil they could do. However, if they're going to use the information to make the whole experience better, I personally don't mind. Having this information could really help increase operational efficiency. That efficency could not only save money, but also help the experience.
For example, Disney could get the very specific information that at 11:00 am on weekdays, customers at restaurant X are less than satisfied with their hamburgers. That should clue them in on the fact that there is a problem, and the investigation should be rather easy. They may find that the cook is doing something wrong, and then fix the problem by correcting the cook on his mistake.
It may seem trivial, but being able to fix even the smallest of issues would be a step toward making the trip literally perfect. Of course, solving (and even identifying) the problems costs money, and so the smaller the problem, the less inclined management would be to fix it.
But back to the the actual survey itself... this is the reason that, unlike the good old days of Disney surveys, they no longer ask "what did you eat for dinner" or "how long were you at the park" or factual stuff like that. Because they already have all of those answers. The only thing they don't have is your opinion.
