Lorena, I too am amazed by the Subway stories. Surely, Ms. Noonan doesn't need to ride the subway for economic reasons; I would think she is recognized all the time, and that this recognition would make riding difficult for her.
I went to High School & College in NYC, and quite frequently (for recreation) rode the subways, particularly the #4 IRT, between Woodlawn & 14th Street, or the #1 up to Van Cortlandt Park.
It was really enjoyable on warm days, when the train was empty -- whether just lying on the benches enjoying the Bronx sunshine, or standing between the cars and enjoying the breeze. That sensation is the urban equivalent of a convertible ride!
But I am a teenager no more, and on those very rare occasions when I visit the city, I never think of the subway as a transportation alternative. I am so grateful for the excellent cab fleets, which economics (perhaps just temporarily) permit me to enjoy.
To me, Ms. Noonan's choice is just another example of her extraordinary qualities. I don't think many other big media names share that style.
In summary, all I can really say is...God Bless Peggy Noonan!