You don't need to move to these specific places in the Netherlands, in pretty much any city/suburb or town over ~3000 or something people you will have everything you need within safe biking distance, including a train or bus station to get around further.

Well, I live in Hilversum now, and _for me_ it's nice, I can bike or use public transport for everything. For _my kids_ it's... OK, but there are too many busy roads with fast traffic that they would need to cross to get to the closest playground, their school, etc.. Also quite a few large SUV's and big trucks.

My kids are 6 and 4 though.

Hilversum is the nicest place I've ever lived for biking and walking, but it's still not as good as Houten, parts of Utrecht, etc.