I can understand your interest, but would advise caution about how you treat any input you get. It's unlikely to be all that relevant by the time you start.
I started in Lisbon on the 25th of Apr, and arrived in Santiago on 29 May. Up to Porto, there were never many other pilgrims walking at the same time as me, but I was starting around 8 to 8:30 am, and quite a few pilgrims were getting away far earlier than that. Some albergues were booked out where they could be reserved, but others with a more traditional approach were nearly empty.
At Porto, things changed as more pilgrims joined, and it was more difficult to find accommodation for the first few days. The general 'vibe' changed as more pilgrims seemed to be focussed on doing longer days than I was contemplating, and a type of 'busy-ness' started to emerge. That settled down for a while, but at Tui, with a major influx of pilgrims, it re-emerged, never completely going away then for the rest of the way into Santiago.
I had no problems finding places to stay on that stretch. If I could, I would book a couple of days ahead, but for some days where I knew I had a shorter day, I would take the chance of getting into a Xunta albergue. That worked.
Other than when I walked the CI, I have found it difficult on the last day into Santiago to walk in quiet contemplation. There is a lot of rushing and noise, and this year was no different. I was tolerant of most of it, although I did find one particular incident disconcerting, and it unsettled me for the rest of the way. Unfortunately, I wasn't prepared for what I saw as fundamentally rude and aggressive behaviour. Whether the individual responsible for that understood that this is how she appeared to others I cannot tell, but I would suggest that you prepare yourself mentally for the worst, and if it doesn't occur, be very thankful.
I had booked accommodation in Santiago before I left Australia, so that wasn't an issue. I didn't think Santiago was all that busy compared to my previous visits, but you will be walking perhaps six weeks later, and the numbers could have increased quite a lot over that time.
Enjoy your walk
Doug