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I turn all of mine. Whether it actually makes any tangible difference or not is up for debate, but A) I have the tool B) it only needs to be done once and C) I dont' feel as if there is any negative benefit.
You will be surprised at the variance in the neck thickness of much of your brass. Whether or not that translates into an off center projectile is your call, but I like the idea that I'm ensuring there is no contact with the chamber wall on one side of hte brass, as well as maximizing uniform neck tension.
I only trim for a couple of calibers - my .243 I turn to .012" and my .223 I turn to .010.
If the brass is thicker (like my current batch of Winchester for my .243), I'll modify what I turn it to. Feeler gauges are great for this application.
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