I'd probably rather step in old, dry goop than fresh, wet goop.
I will say, that for as clean as they keep WDW, it's got nothing on Tokyo
Disneyland. While waiting for the parade, a kid spilled a small drink on the pavement, and a CM was there within seconds to clean it,
to scrub the ground, and it was like it never happened. The thing I find most interesting is that in Japan, the people will not sit on the ground. They have either special mats to sit on (no shoes on the mat) or a park map will do in a pinch. I'm thinking this is the cleanest ground I've ever seen to begin with, much cleaner than the ground in Orlando or Anaheim, and I sit on that pavement all the time.