For years I have read and heard that the Solar System is there because of angular momentum issues. That is to say, the Sun itself can only rotate at some maximum rate in order to stay intact and the planets are there to equalise the angular momentum of the original nebula and produce a stable star. Well, that argument should apply to more or less every other star as it was formed so we should have expected there to be many extrasolar planets. I guess the 'big deal' was actually managing to detect extrasolar planets which was no mean feat. Perhaps the presence of rocky planets and Goldilox conditions is more significant to us, though.