We do now have a complete dual carriage way though DJ - the A11 - and folk are worrying about it may increase the crime rate!
I'd be careful if you're moving here to check where the new estates (sorry developments) are being built. Costessey, where we lived for 35 years is being developed fast. Wymondham too. Not so much West Norfolk - more rural and has the best train route to London. I live in Aylsham (which did loose out to Tesco in the end) and can recommend small town living. We still have quite a few local shops, there's more going on and it's very welcoming. And generally have a half hourly bus service! (Nothing at night.) Wroxham has a train line - and station(!) but it's best to forget rail travel except for the tedious journey to London.
The Norfolk and Norwich (N&N) hospital is very good - but it was built too small and is often on black alert for emergencies. DS and DiL live near Kings Lynn and say the QE2 is the same. Fine, if you're not in a hurry!
As has been said Norwich is vibrant and I believe in the top five nationally for shopping, although we don't go in much as we have good shops and Holt (more expensive and more cut off) has really nice shops. Wroxham is good for most basic stuff too. For suburbs of Norwich, Eaton and Cringleford is the posh bit and has the best bus route into the centre, Costessey and Sprowston are being developed big time if you're looking for new build, Thorpe, Catton (has the airport and the helicopters can be noisy), Hellesdon (the other side of the airport) are middle of the range.
So much depends on what you like to do, health, etc. We like watery stuff so Aylsham suits us fine. We did look at Woxham/Hoveton as I grew up there but nothing we like came on the market at the right time.
If you're more cosmopolitan it's worth looking at living more centrally in Norwich, although you will pay a hefty premium for somewhere with parking. (There is a fast growing car pool/share system). There's a lot to consider but, talking to friends who have moved here from London, the main thing is the change in pace, life suddenly becomes much, much slower and London no longer exists. It's somewhere as foreign (and difficult to get too) as Paris, or Manchester! Norfolk is still quite insular.