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And now don't forget about [ClusterClassify][1] either ;-) [1]: http://reference.wolfram.com/language/ref/ClusterClassify.html
Running your snippet takes indeed as much time if you're indicating, but when I do a timing of my piece of code, written in exactly the same way as yours (so suppressing the graphical output), it does not halt....
Probably better to cite the version of Mathematica actually used. That said, I certainly agree it is good to cite the software whenever that aspect of the contribution is significant (as would be the case here).
I found a computational geometry package that may be able to help you. CompG allows you to find intersections between lines and the strength of the intersection. I believe you can also use this package to find intersections between a line and a...