I live in the Netherlands. Started off in Gelderland and now I'm in Limburg.
I love it and have no desire to return to the UK. I've been here nearly 20 years now.
DH and I both speak Dutch and DS, who was born here, is fully bilingual.
The climate is fairly similar to southern England. Inland, where I am, the summers are hotter and the winters are colder.
The education system is pretty good and there's a lot for children to do. School times vary but are usually 8:30 - 14:00. Clubs and activities are very inclusive and easily affordable. Children's clothes and shoes are expensive though and not especially good quality. We buy DS shoes from Clark's, and have just done a big M&S shop for everything else.
Agree with the poster who said that it's superficially like the UK, but then isn't.
People are very blunt - especially in Holland and Rotterdam. They can shock even my Limburg work colleagues! You do get used to it though.
There isn't so much prepackaged food compared to the UK, and I find it more expensive. The Dutch eat lunch at 12:00 and the evening meal at 17:30, so sports clubs etc tend to meet in the early evening, at 19:00 or so.
The coffee is very, very good.
Liquorice with salmiak is an acquired taste.
And stroopwafels. Yes. Oh yes. 
Oh, and you can absolutely go hill walking where I live!