I write linearly as well. Only once have I written a scene out of order and that's because it was the crux of the story. Everything that happened before and after depended on how this scene played out. It was strange, but it worked really well.
Sometimes I know exactly where the story is going. Other times I'm along for the ride. I have a general idea of what the story is about and let it flow. For example, I'm working on an SGA story now that is supposed to be the aftermath of rescue. I'm 5000 words in and just got to the rescue. I know in general what's going to happen but no specifics. I have another one in the works that I know exactly how it will end including some dialogue even though I haven't written a word yet.
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Sometimes I know exactly where the story is going. Other times I'm along for the ride. I have a general idea of what the story is about and let it flow. For example, I'm working on an SGA story now that is supposed to be the aftermath of rescue. I'm 5000 words in and just got to the rescue. I know in general what's going to happen but no specifics. I have another one in the works that I know exactly how it will end including some dialogue even though I haven't written a word yet.
Strange, no?