I love that section of the Camino, and I have only ever bussed into Belorado from Burgos on my last combination hiking/bus/hitching/train journey back from Compostela. (about an extra 150-200K walking I think, including one absolutely glorious 30-35K day on the Meseta)
I still never understand why so many people seem to want to start walking from further away than they can walk in their available time. The Camino does not start in SJPP nor end in Compostela -- it starts and ends in one place only : home. Although to walk to Compostela is the basic essential sine qua non of the foot pilgrimage to Santiago.
I do understand that people's motivations vary quite massively, but the Camino is still a thing in itself, that one would do better IMO to not try and control, but learn to live with, in a manner not unlike the wisdom suggested in either Saint Exupéry's Le Petit Prince/The Little Prince, or Khalil Gibran's The Prophet (NOT the seriously annoying and very flawed ideologically skewed animated film version of it).
Yes, better (but also more abstruse) texts concerning the kind of everyday simple spirituality that the Camino seems to be made of exist, including even the lovely mademoiselle Warcollier's original little xerox'd leaflets, but these belong to the concerns of only a few of us pilgrims -- whereas those texts, and perhaps also such works as Albert Camus' unfinished and yet magnificent novel Le Premier Homme, or Bill Bennett's cheeky pilgrim journal The Way, My Way, or Nancy Frey's pleasingly approachable academic Pilgrim Stories have an earthiness to them that the dodgy idea of "it's my Camino" can never provide.
The Camino isn't mine ; the Camino isn't yours. The Camino is ours.
We become pilgrims when we surrender to the fact that it's not anything that we can ever possess, but can only ever belong to.
Bus and taxi stages are about control, not surrender, nor belonging -- they are not of the pilgrimage as such.