For no-longer-new riders, I think training continues to be valuable. If you have never taken an advanced skills course, I heartily recommend it. I always get something out of it. I know lots of riders who were anxious before they took it, fearing their skills were inadequate or that other riders would be much better. But I have only talked to one rider who didn't enjoy it, and that sounded more like an issue with the instructor than with the course itself. It is worth taking every couple of years.