As Matt Buchanan notes, wristwatches have always been passive display devices — you glance at them to see what time it is, but (unless you’re setting an alarm or using a stopwatch function) you rarely have to do anything to it to make a watch work. Passivity is also how fitness bands like the Jawbone Up and the Nike Fuelband work. With certain models, you can look down to see how far along you are in your exercise goals, but to do any actual configuration or tracking, you have to connect them to a device with a larger screen.
It remains a mistake to think of these devices as watches. As I’ve said before, these things are going to be even less analogous to a wristwatch than the iPhone was to a telephone.
That said, I do agree about the importance of passivity with these devices. That’s one reason I think the Galaxy Gear is going to be DOA. They’re just thinking of it as a smartphone with a smaller screen — one which still requires being tethered to another smartphone to be useful in any way.