Those are more used to gauge what things guests prize - Universal and Knotts have similar things in their surveys - and are designed so that the people analyzing the data can figure out which specific perks are more coveted by guests. Like, if most surveys show that guests favor passes that feature discounted or free parking, then Disney will be likely to include that in their new offering. As-is, it's only a data point of various ideas that the company is willing to consider.
Funny I voted for the free parking in the survey that was sent to me too. I would prefer more block out days as long as that was an option with it. But I agree, it seems to be more about what you are willing to sacrifice along with what you aren't. And most passes you always sacrificed something minus the top pass of course, it just comes down to what people value the most, ie, number of days versus the amount of perks.