While I would not call my 12.5 inch truss scope large, I think I can give an answer to your question.
I have not had a problem with wind and my scope, in a breeze I was willing to observe in. I mean to say, if it was blowing enough to negatively impact my scope, I did not find it enjoyable to observe.
As a point on this issue, a "smooth" dobsonian mounted telescope has a balance between ease of movement with some pressure and friction. It does not spin freely like a lazy susan. It shouldn't move by itself but should use a gentle hand pressure to move. A light breeze should not be sufficient to make it move.
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