TOD: I echo John G's comments; THE NEW YORKERS was a total joy!
Tie for a close second place from what I saw this past year:
On Broadway -
GROUNDHOG DAY - a show that I wish had had done better commercially, but I think a lot of audiences don't go home telling their friends they absolutely have to go and spend $100 and up to see it, when a musical has a lead character that keeps us at an emotional distance until it's into act 2; but I totally loved it, maybe because from the movie, I knew all along where the character was heading to emotionally. (I wonder if they relied too much on people knowing the arc of the film???)
HELLO DOLLY - with whatever faults many found, it was a total love of a show, and a love-in for Bette Midler, David Hyde Pierce and cast, and of course for Jerry Herman and Michael Stewart!
Not on Broadway -
a beautiful revival of MORNING'S AT SEVEN (in a church on the Upper West side), which even in its small theater, didn't skimp on the sets, or the laughter and emotions. I went because an old friend was in the play, and he was very impressive, and so was the whole show! (Something I don't recall having seen before: At first, one of the older actresses had seemed tentative in performance, which was worrisome and made you think "Uh, oh", but then very soon the character came out of her "shell" and it was clear that the actress and director had made the beginning-of-play acting choice to show the early subterfuge in the character.)