Oh yeah, definatly from the rain and storms.
No one, and I mean no one likes to be out in Florida during a storm, double for us locals cause we know what happens. Could be clear at water, and bam! your hit by lightning. So normally we wait a little bit for everything to be like "officially" cleared out before we start anything.
As far as the tracks go, the trucks are the heavy duty types so they will be noticed in the grass even after they've passed through. Take the monorail, and look at the paths they have for the trucks throughout the wooded areas.
During our main rain season, its nearly impossible to set foot, or tire on the grass and not leave some sort of mark.
If you want to talk about landscaping problems, you shouldve seen the area for the seating at the main courtyard for WS at EPCOT, there wasnt a living flower in that entire group....and this was with all that infernal rain we've had.