I grew up in England, now live in the US and wish there were more roundabouts here. They can work extremely well and are quite OK to navigate by bike once you have built up a bit of experience and confidence. The only situations I dont like are the very largest intersections between major roads & motorways (freeways) because traffic speeds are higher.

I really don't understand the USA's love of the stop sign. I think it asks far to much of everybody's patience, and is not even implemented consistently. but that's not for here...