I like the option of having just a tiny bit of a dessert. That way I can try lots of desserts without feeling like a total glutton.
It's hard to bring something to a BBQ that people will like that's still simple and quick to throw together. Throwing a few bits to fruit onto a stick is pretty much as simple as it can get. And who doesn't like a rainbow! You can dress up that boring buffet table covered in potato salad and baked beans!