We moved here when the boys were 3 and 7 and now they are 13 and 10.
Due to the layout of the house the much wanted "family room" could never happen. We knew this before we bought it so worked around it.
We converted a double garage into a playroom and banked one wall with storage which houses coats, shoes, bags, toys, 32 inch tv, wii, x box, toys, more toys and more toys. I think we have every board game Toysrus sells 
We did not hook up actual tv into there otherwise we would never see the children. They eat breakfast in the kitchen on weekday mornings whilst I unpack dishwasher/make packed lunch. We eat in the dining room for dinner, all gathered round the table talking about our day.
After dinner the lounge is where we all huddle together, we watch tv/youtube etc and talk.
The lounge was a no toy area because the playroom is so big they can leave out toys like train track, hexbug runs and it has a large sofa bed in there so I could sit in there with them when they were little.
It has a double desk in it and they do their homework in there too.
There are no tvs or computers in their bedrooms, they are for sleeping and reading in.
Although I love the idea of open plan, when I have cooked a Thai green curry I am glad I can close the door on the kitchen and let the extractor fan do its work. The washing machine and tumble drier are in the utility so I can hang clothes up in there and no cooking smells get in.