@Kaze:
It sounds like the DF's were just recently discovered. The only time I saw the mention of the DF was when we all saw the flash back of rogers crew, hen buggy got his hands on his fruit, but that was it. But other then that That's it. Discuss please.
I think reactions on the Devil Fruits depend on places and persons. Twenty years ago, when Nico Robin was a DF user (damn, the english phrase sucks so much, the german is way better), most people were frightened of her, because they maybe didn't even know that it was the effect of a Devil Fruit. Ten years ago, Shanks' pirates were awestruck (hope that's the right word) by the fruit, but they had a few informations about it (at least they got the name, for a Devil Fruit that's actually the only thing you need).
Nowadays, in East Blue, the people are still appalled by DF users, but once they recognized the opponent is a DF user, they're losing most of their fear. On the Grand Line, the rough patch as is known, they even seem to notice an opponent as a DF user additionally, like Luffy's and Nami's first guess back in Water Seven, when they met Franky spitting fire, first of all they thought of a Devil Fruit.
It really depends on the person and the place you are. Of course it also can be that on the next island the Strawhats come, they meet an underdeveloped tribe of islanders who have never even heared of Devil Fruits.