I think about MotionPlus every day, and everytime I play a game that would have benefited (Samba De Amigo)
The Conduit has no need for Motion+, Wii's FPS controls rely on infrared, which is perfect as-is.
And make no mistake, Wii Sports Resort is a hardcore game. Motion+ means increased difficulty, the Waverace game looks as good as Waverace, 1:1 sword fighting is already causing a stir among journalists, and there will no doubt be rabid competition for high scores.
I still can't believe Nintendo is releasing MotionPlus, making their best feature better. It would be like Sony vastly upgrading PS3's graphics with a $20 add-on. It's the sort of thing that's usually reserved for a next gen.