This kind of setup is increasingly common here in the UK, except the pedestrian crossings are implemented with lights too. This comes as a shock when first implemented, followed by a feeling of anger at the stupidity and the risk it will put pedestrians under, followed by annoyance - but I've not heard of an accident involving a pedestrian on these junctions here, only involving cars rear-ending other cars because they weren't concentrating well enough or were driving too fast. That said bridges and subways are more inconvenience to pedestrians, not to mention more expensive.
These improvements often also go hand in hand with alterations to introduce spiral lanes on the roundabouts to assist the flow of traffic. Except that a lot of people completely ignore them (through ignorance, stupidity, bloody mindedness or "cos that's what I've done for the last 60 years") often making things more confusing and for people to concentrate a few yards ahead rather than brakingDistance++ ahead too.
In the UK a pedestrian has right of way (highway code rule 108 I think) so I'm not sure your comment about responsibility is correct. Perhaps pedestrians in the UK are more used to idiotic driving (we are king of chav culture, boy racers, and breaking the speed limits after all) are more conscientious? That said, few pedestrians realise one has to place a foot on a zebra crossing before the traffic has an obligation to stop, so maybe not!
Incidentally, my short commute to work (7 miles) involves 9 roundabouts and 5 sets of traffic lights. Fortunately none of them have crossings on the exits.