..I really don't see why one should have to ring the bell, but it works a lot less than 90% for me. Some do get out of the way. Many are wearing headphones. Many become aggressive and stubbornly stay in the path.
Maybe people are happier in the Phoenix Park. Also we have the option of going around them on the grass which you don't have. Thought that can backfire if its wet.
That said as the weather improves its gets worse in the park. In the mornings and the winter in generally you don't get as many in the park at commuting times. Summer evening is the worst. But then its tricky to cycle and hold a ice cream cone at the same time.