I'm in commercial construction, there is a reason we use hard flooring vs. carpet in heavy traffic areas, it's because it's far more sanitary and easy to clean. There are some areas where we are not allowed to put down carpet, because of health department restrictions.
A quick vacuum and then a steam mop will get the room ready to go in less than an 30 minutes, were a carpet shampoo would at least 2 days. One day for the cleaning and then one day waiting for it to dry. A vacuum simply can't clean all the greasy residue that accumulates in the carpet over the years. Anyone who has ever cleaned their carpet at home should know how filthy that stuff actually is, even if it look clean on the surface.
We've stayed at CRS GDT 3 times and AKL 1 time since they changed the flooring and we have never had any issues. (All 10+ day trips) My wife has long hair and she absolutely sheds all over at the house. Haha
Regardless, if house keeping doesn't do their job properly both hard flooring and carpet will be nasty. I've found a quick friendly call to housekeeping at WDW will solve all your issues! ha