Have only read up to page 16.
I just booked flights with Ryanair as they are the only airline that flies to where my sister lives. Last year the only prebookable seats were the ones near the emergency exits so a child wasn't allowed to sit in them anyway. We got to the airport stupidly early, dp sat down while I stood for ages in front of the boards to spot the gate as it opened. We were 2rd in the queue. We got on the plane pretty early (no thanks to the people who charged past us and practically trampled the dcs aged 5 and 6 then on their way to the plane and up the stairs). We did get seats together but it was stressful and the same coming home.
Today when booking I noticed that just a few more rows than the emergency exit ones, were bookable. I'm travelling alone with the kids this time and had put off booking so far, simply due to the stress of the rush for seats. The extra £60 I paid today to have reserved seats near the back for both out and back journey, was the easiest £60 I have ever spent.
However, the bulk of seats on the plane were still unbookable, so if I'd left it another week or so we might still have had to be in the general rush for seats.
One point people are missing is that the budget airlines operate on quick turnaround times. The rush for seats on Ryanair is deliberate, it makes people get there early and makes them get on the plane, grab seats and sit down quickly. Also they tend to fill up the seats in rows going down from the doors - when seats are all allocated people move more slowly and block the aisles for people who need to get past them to other rows.
The seats on Ryanair are bloody cheap. If I was travelling alone or with dp I would not bother to book or pay priority boarding as it would not matter to me where we sit. But when I am travelling with the children, paying extra to avoid all the stress of the scrum is a no brainer for me.
If dp was coming with us I think I'd just book 2 seats, for one of us and ds2. The other parent and ds1 would risk the scrum.
Easyjet 2 years ago was awful for us, coming home it was just one big crowd at the gate. People with priority boarding shouting and trying to get through, people elbowing our children out of the way even though they were under 4 and we should have gone on after the priority people. I said since then I would never fly easyjet again so its good to hear that they are also allocating seats now.
From stories I've heard about planes missing departure slots due to people who arrived late and won't sit down because they are not next to their travellign companions, it looks like the airlines decided that planes full of unallocated seats is a bad idea.