I you want to see a country that appears to be extremely fond of roundabouts, you should come to the Netherlands. In the past 20 years a high proportion of crossings has been replaced by roundabouts.

We do not always have sufficient space, especially in city centers. The normal solution there is to make traffic one-way only. I do not know if they consciously try to avoid left turns, but it would seem to make sense.

I would certainly advise visitors not to take their car when visiting a Dutch city center. Using public transportation is a lot easier (and cheaper).