Sorry, one more 
Delphinium, I've often found myself wishing that some (or all) of my dc would be reasonable and easy going, but apart from ds3 (very laid back toddler), they're not. Dd also gets very anxious, but also has no filter, so if she's worried about it, she's already told me, so we can work through it.
All my older 3 are high maintenance, not easy children at all, but looking at your last few posts, perhaps that's not a bad thing, because it would be very easy to overlook them when ds2 needs so much supervision/support.
I can't say how my dc will feel about their childhood, probably resentful on some levels. If they go on to have easy children, I don't think they'll understand at all. If they have tricky children, I think they'll have some level of understanding.
I can see from my dc's point of view that it's not easy for all of them, but to a certain extent, Dh and I are powerless to change things. It's exhausting, but we can only do our best. We try to use other's experiences (mn and real life ones) as hind sight to try to get things right for all the dc.
I hope that the dc get on better when they don't live together.
Sorry, rambling on again! All dc are still asleep, so I'll go and have a quiet cup of tea :)