Thanks all, these are helpful thoughts.
I did get a pair of Conti 4-season tires after I fell, and those help a bit though I still take it slow on downhills where I can't see around the corner. I figure it's worth taking an extra minute on a downhill vs. being out of commission for a week or two following a crash.
The weird thing is that I thought the anxiety would subside after a couple of weeks / a few hundred miles. A couple thousand miles and a few months later though I still get nervous. Maybe things will just stay that way.
Anyway, thanks for the replies.