Tom I have asked myself this question so many time
I walked the entire CF in 2014 and went back in 2015 but just for ten days... in 2016 I walked the VdlP/Sanabres and then in 2017 I did another week on the CF. I've loved every walk... every time I return to the CF I've loved it and I've seen different things... different people, different experiences... it feels like coming home... and so far I don't see the desire to go back waning.
Next week I am leaving for Spain again and I have mulled over and over which route to take... the weather, transport problems and a few health niggles have all pointed me back to the CF... this time I'm going to start around Burgos (I've not walked that section since 2014).
I'm worried that it will be busy... that maybe in some way it just wont be the same without the majestic mountains at the start... I've pondered so many different scenarios but then I watch the BBC programmes and it reminded me of how beautiful the CF is... I revisited my blog and the emotion of that first walk still brought a lump to my throat and a tear to my eye... I've watched The Way about 3 times in the last week... packed and unpacked my bag... tried about 17 different options for getting to Santiago via Gronze and Godesalco and I'm ready. I'm returning because it's there... and it's calling me... and I need to go walk.
I've decided to stop asking why... because I always try to answer myself and my worries make me second guess everything.
I'm not sure my answer here has helped you much... but I'll let you know more in about 4 weeks time when I come home.