It's not a feature I've looked for or used before. It did make me notice that the other two editors I use most (GUI) often position find/search results about 2/3 or 3/4 of the way up in the window vs. nano's in the center. I guess that's assuming you are a bit most interested in what follows than what precedes. Not noticing before I guess means it didn't make that much difference for me.
I didn't find any centering cursor position feature. Interestingly one has a "Center Line" feature but that moves the cursor not the view, I have no idea when that would be useful.
-Mike