Those would be the people who took
hours longer getting to WDW than you did - while they were stopped for the night at a roadside motel, the train continued moving. The tourtise and the hare phenomenon, just not quite so dramatic, and here the tourtise can sprint along pretty fast whenever the dispatcher will give it the chance....
With complete respect for your opinion (not everyone likes the same things, else there would be only one flavor of ice cream...), it seems like trains are often held to a higher standard than automobiles or airplanes (or maybe even buses). Time and time again I hear about
one bad train trip (often years earlier) as the reason someone swears off train travel forever. But the same traveler can name several (maybe several
dozen) recent bad experiences on the airlines, yet they keep flying. You may see traffic problems every day, but don't give up on driving. But let the train have problems just once and it's done forever!
Again, not everyone has to like train travel (though with all the hassles of flying anymore, the airlines keep sending "converts" to the rails...), but don't be suprised that many people prefer the very mode of transportation you so dislike. Indeed, the
exact reasons you list above (coughing, etc.) for disliking the train could equally apply to any airplane, unless - like water - they have recently banned coughing, sneezing, delays, and turbulence.