I have only been up the Gribin ridge once, and that was walking, but in wet, claggy weather. I didn't find it difficult to find a route, but I'm fairly sure that my route was far from optimal.

Travs, you have spent rather more time on Snowdonia's mountains than I have, so I find it reassuring to read that you also find the descent from Glyder Fawr to Pen y Pass confusing (as I did on the Half Peris), even in good visibility. The red dots painted on rocks are very little use, and the buildings at Pen y Pass are not visible for most of the descent; and in any case, the real problem is finding some decently runnable terrain rather than ending up looking down a crag or in front of a yucky bog.