There are pole-users, those that have them and don't use them, and a few that don't have them. I walk with poles consistently, and wouldn't walk without them. I used them every day on the Camino. They took some weight off my knees all the time, and were a stability aid from time to time.
If the latter is all you want them for, then you won't need them regularly.
Remember that you cross two other mountain ranges if you are travelling the
Camino Frances, and they offer similar challenges to the Pyrenees, although perhaps not as sustained as the downhill stretches between Roncevalles and Zubiri as an example.
What I observed was that most people might have their high tech poles in their hands, but aren't really using them for anything much. They might as well be using any old fairly straight bit of wood for all the use they are making of the handgrip and wrist loop.
My view is that if you are going to take them, take the time to learn how to use them before you go and use them all the time. Find Pete's pole page on the web for advice on how to use the poles.
Second, get rubber tips for the poles. There are a couple of different types, and I use a 'walking tip' when I when I train locally, but will also use the other variety when I am bush walking.
Whether you take them or not, all the best for your Camino.