Start the Party
Singstar Dance
Sports Champions
EyePet
Ape Escape
Toy Story 3.
These are all casual Move titles, most of which are releasing at launch.
Motion controls dont have to be just casual. They do infact provide the opportunity for different experiences, like holding a flashlight in Echochrome 2, or drinking a potion in Sorcery, or provide the "quick fun" you were talking about earlier with all of the above titles.
Sony is catering to both the casual and hardcore gamer. So in my opinion, the Move will be a moderate success!