When we moved to DC (1960) I heard my mother curse for the first and only time when she got to the inside lane of a multi-lane traffic circle in heavy traffic and didn't have the experience (knowledge+courage) to move over so we went around a few times. Eventually she learned and didn't mind them. I grew up with them so don't mind them.

A Dutch traffic engineer figured out that roads were safer if drivers paid attention more than if they were ordered about, that traffic circles make people pay attention, are safer and faster.

My city added them a few years ago. Dissidents or ignoramuses drove over them, went the wrong way when they wanted to turn left, etc. The traffic column in the paper was full of complaints. But after a few years everyone seems to have figured them out. I haven't seen the stats for whether they've made roads safer, but the complaints have stopped.