Haha I voted YANBU. But I would totally have voted YABU before I had kids.
But since then, it's totally reasonable. I was invited to queue jump last time we flew, by staff both here in the UK and then coming back from Spain.
We didn't book priority so we were all geared up for long queues, soon as we got to security, we were ushered via the priority queues until we reached the plane.
One reason - travelling with a baby does mean taking a whole heap of stuff that is not plane allowed (liquids to make up a bottle, baby food etc) we were ushered over to a priority queue where the staff dealt with people with kids and people with disabilities - meaning no confusion and also special trays for bottles and baby formula. I didn't even know these existed before I had kids. You have to see it to believe it. The trays have foam in-lays where your baby stuff is placed to go through the scanner.
And the scanners we were directed to had a compartment for prams, wheelchairs etc - you put it through a side section (like a luggage conveyer belt) rather than having to lift it onto the normal conveyer belts.
They also had slighly different security body walks for people carrying babies - if I remember rightly? I'm sure they were slightly different.
The airports aren't doing it because they feel warm and fluffy towards babies, they do it to be efficient and so that everyone else doesn't get further inconvenienced and have to wait even longer.
People should be urging people with babies to go get fast tracked. So not unreasonable at all.
Quite frankly yes the plane will take off faster/on time if people with babies in buggies are dealt with seperately. Otherwise you're the poor sods stood behind us in security while we decant a whole rucksack of baby crap, fold down prams, disconnect our baby carriers, clear out the pram basket, wait for someone to come and hold our babies while we do this. Take off any extras from the prams (footmuffs and things) and then swing it onto the belt. Then use 10 trays to get all our stuff through......