Roundabouts are more and more popular here.  Personally, I hate them.  People don't know how to use them.  I've actually seen trucks going the wrong way on 'em.  o_O
Actually, the circles around here all have traffic lights anyway.  Some of the ones I've seen in New England do without, but the big one in Keene NH has lights.
Roundabouts aren't rocket science. A little driving re-education might be required, but the pay-off in terms of reduced driver frustration in the long run would be well worth it. Traffic in the UK would grind to a halt without roundabouts. The only one I ever came across that confused anyone was the so-called Magic Roundabout at Hemel Hempstead where there is a large central roundabout surrounded by six mini-roundabouts. That wasn't a nice feature to find on one's driving test.
When I was in college, they showed us a plan for a community in which every intersection was three way instead of four way.  They expected it could all be regulated with yield signs instead of stop signs.  I've never seen it implemented, though.