As the vast majority of voters were already voting by mail, this only makes it official. In addition, and this is really cool, those that still want to vote in person can... and they have 18 days to do it instead of being limited to a single work day. The downside to that is that it will be in limited locations. But over two weeks to vote is a very good thing.
I never, ever, felt comfortable going to a local church to vote. When the state allowed "permanent absentee" I signed up immediately. I think this is a good move.