How much time can one save getting back to Kaanapali by doing the complete loop?
Easily 2-3 hours.
Is it as scary as the webpage makes it sound? I suppose it depends on you and what you're used to. I don't find it very intimidating, but I've driven it many times. If you do the loop, you will be on the land side all the way (ocean on your left) so that would be even less frightening for anyone a little anxious about it.