Sorry for perhaps being pedantic, but that's not the same thing. "Oh, I know where you come from" is entirely different to "I know where you're coming from". As Brianna stated, "I know where you're coming from" would basically never work. I can only think of one situation where it might happen. I used to work in hotels and sometimes people would call the hotel because they were driving around town trying to find us. In that situation we would ask them to tell us where they are currently with street names or landmarks and once you realized where they were at that moment you could, potentially, say "I know where you're coming from". But it still wouldn't be the best choice of words and I can't think of any other time it could even happen at all. Unless, as Brianna suggested, it's all simply a matter of grammatical differences in languages other than English, which seems likely.
Originally Posted by RageAndLov
“Today a young man on acid realized that all matter is merely energy condensed to a slow vibration, that we are all one consciousness experiencing itself subjectively, there is no such thing as death, life is only a dream, and we are the imagination of ourselves.” – Bill Hicks