I did it about 7 years ago, the whole thing from St Jean Pied de Port in France to Santiago.
I went with someone but lots of people did it alone and met their "group" along the way.
The feeling of freedom, seeing the sky all day long, was amazing.
Having a daily purpose and goal but nothing much else to worry about.
The physical exercise is so good for you and you sleep like a log 😂
Of course some amazing scenery and beautiful cities and towns.
Walking in the countryside, seeing robins, butterflies, birds, dogs, flowers, olive groves, vineyards.
The feeling of adventure!
The huge sense of achievement at the end.
For some the bonding experience of making friends along the way.
Not to mention in my case, the very exceptional five weeks off work which felt really, really good. Some was unpaid though.
There are many ways to do it - one section a year, by bike, by horse, get your luggage transported each day or carry it yourself, pay someone to book your accommodation or wing it for cheaper.!
I think about it almost every day still and it is one of the best things I ever did.