What does this new law mean for me as a student?

Very little. It remains true that nobody is permitted to materially disrupt the expressive activities of others or materially disrupt previously scheduled or reserved activities on the campus. You still have the same free speech rights you had before. One change may be that you have some additional competition for open outdoor areas of campus in which to engage in expressive activities. Another possible change you might notice is that, because, the law places an emphasis on not disrupting expressive activities of others, prohibitions on such disruption will be strengthened.