OK here's my look on the scene: Luke is alone in Dagobah, crashed his ship into the swamp, dosen't know where Yoda is or even if there IS a Yoda - I mean, I surely wouldn't be in the mood for some corny jokes at such a tense time. If my droid feel into the swamp, eaten by a pseudo-monster thing, and gets spit out, I'd not make a joke-y reference to it. As I see it, the "don't tase very good" line ruins the whole psychological mood for the scene, adding an unnecessary and distracting comic releaf to that moment. But hey, that's how I feel about it, I'm sure you guys have your reasons for prefering the "taste so good" line.