Each of the verses in "Travel is Broadening" describe actual trips The Old Goat took. The places were on the airlines mentioned as were the events at each stop. He was struck by the consistency of the monotony of both the airlines and hotel decor. McDonald's existed in every city as well, so what better symbol of the homogenization of America than Big Mac and fries?
The only thing not true in each verse was that The Old Goat was not eating his meals in any fast food restaurants anywhere. He was traveling each time on an expense account and was eating room service at the hotel or getting waited upon at descent restaurants.
That is not to say food in such restaurants can't be broadening.