Recently my wife and I visited the place. We were impressed, the huge praise is well deserved. We saw a gorgeous collection of art works. And the building itself - and the location (at the southern end of The Highline, a park on a disused New York Central Railroad spur) is worth a visit. The Whitney is of course a magnet of the public. Buying tickets online in advance (at least one day before the visit) is recommended.
I show her my very personal visits, mostly somewhat "inter-active" with spectators to give an impression of the popularity. On top of this post you can see Mark Rothko`s "Four Darks in Red" (1958, oil on canvas). I think this is one of his best pieces.
The girl above this paragraph takes a look on Edward Hopper`s "Seven A.M. "(1948, Oil on canvas).
I consider Keith Mayerson`s "9-11" (2007, Oil on linen) as powerful & shocking.
Thomas Hart Benton´s "Poker Night (from A Streetcar Named Desire)" (1948, Tempera and oil on linen) is also an eye catcher.
The Whitney rewards her visitors also with the great views you can get there on the neighborhood and on Manhattan, as you can see below: