If you're going through a list of all a park/resort's rides on one page, it's probably more important to the average guest to cut to the chase and get to the need-to-know information, especially if they have young kids, than to front-load with the fanciful description.
I'm not saying the lawyers have nothing to do with it, but there really are average guests visiting the parks that want to know immediately what a ride does so that they can determine if they or (often more importantly) their small child would want to do the attraction. And some adults want this information too-I've been to parks, Disney or otherwise, with grown adults that didn't want to do anything that had drops, or involved getting in a ride vehicle, or anything that got off the ground (seriously-worst park visit ever because that person did like three rides the whole day and the other person was willing to placate the do-nothinger, leaving me the only person doing rides at a park
). The full description is still there for people who want to click on the page.
And this isn't just a Disney trend either; it feels to me like the average website is less wordy and more to-the-point than they were 10-20 years ago.
So if anything, don't blame Disney, blame
the rubes that now dictate how websites are designed for pretty much every company, and certainly pretty much every site for a tourist attraction.