I love that lyric, I think it adds to the sense of tiredness and "being there done that" the song is going for.
You know what Sondheim lyric I can't stand? The pedestrian and unnecessary rewrite for "Last Midnight," particularly: "You're so pure/But stay here and in time/You'll mature," which I find quite empty and obvious. The original "you're so nice, you're not good, you're not bad, you're just nice" to me does a lot to explain where the Witch's character is coming from and provides an interesting perspective (hers) on the rest of the characters.
"Some people can thrive and bloom living life in a living room, that's perfect for some people of one hundred and five. But I at least gotta try, when I think of all the sights that I gotta see, all the places I gotta play, all the things that I gotta be at"