Things have definitely changed.
When I walked the first time, there were plenty of opportunities to be alone.
Now, you just have to plan to walk the shoulder season - NOT June, July, or August,
and you have to learn to walk "between
Brierley's stages" and "between the wave" of pilgrims.
It's still possible - you just have to be smart.
As far as those walking without a pack, on my first Camino I remember being horrified at the busigrinos and tourigrinos getting off at the top of the hill between Orisson and Roncesvalles and literally RUNNING down the track while the rest of us were crying each painful step. At Gonzar, I was OUTRAGED with the groups I saw carrying wee tiny packs. How DARE they walk so unencumbered and enjoy their Camino!?!
Now I lead groups of 8 on the Camino and guess what?
We use pack transport!
We also book lodging ahead.
Do I feel guilty?
Nope.
Why?
1) I've paid my dues. I've walked more than once carrying my pack (and I'm not saying everyone must, either)
2) There are many people who are not able, physically, to carry a pack - would you tell them they can't walk? There are others who CHOOSE not to carry a pack. So what?! If they can afford bag transport, they're contributing to the economy of the people living along The Way.
3) I do not stay in municipal albergues, but book private lodging, which, by the way, the numbers of which have greatly increased since I first began walking.
4) Since the Camino began, people have ridden horses, taken wagons, and had their luggage transported on the Camino - it's nothing new
and finally...
5) The ONLY rule to getting your Compostela is that you must WALK the LAST 100 KILOMETERS.
There is NO RULE about carrying or not carrying packs, and certainly none along the rest of the route.
If you choose to carry your pack, and if you are able, go for it!
But please don't judge others.
As to the many groups, yes it can be frustrating, even to me. Lodging is booked up a year ahead by groups. I have to begin making my lodging reservations at least that far ahead of time.
This leads to wonderful rules like those made at Guacelmo where they insist you must walk in carrying your own pack (and of which another group of pilgrims complain).
You can't please everyone.
And it's not our job to be the world's police.
Just go.
Give yourself enough time to logically make the trip, then let the Camino guide you.
There are still plenty of beds...