I don't have kids but I live in Glattpark, so while I can't answer all your questions I can give you my thoughts on some.
There are a lot of swings, slides, etc throughout Glattpark so kids have lots of places to play. I see kids outside all the time playing alone, and there seem to be a lot of them. The big lawn next to the lake also provides a place for games/activities that require more space.
The airplane noise is something I was very concerned with before I moved - my previous apartment had absolutely no noise (the only noise was a bus going through every 15 minutes) but it turned out to be fine. With the window closed we hear almost no noise, and I have no problem sleeping. I've grown accustomed to it by now so I can easily sleep with the window open as well without waking up when planes start going by at 6AM or so. Another source of noise is frogs, they can make quite a racket
I can hear them in the distance but they're not very close to my apartment, so they don't bother me.
For the last year there's also been construction work on a new apartment building right across the street from our bedroom and the sound is well insulated enough that not even that really bothered us. We could hear some rumbling from the airplanes and the construction work, but not enough to be a problem - just the occasional sound that goes through when they used certain types of louder equipment, or an airplane passed closer than usual.
We've been here for a little over a year and a half and don't plan to move any time soon.
So if you're particularly sensitive to noise and need absolute quiet to rest it might not be the best area to live, but otherwise it should be OK.