Its certainly not popular...popular is used incorrectly its more to do with no other available internet access for most people.
Discussed on Ireland Off-Line forum on boards.ie
Taken from: http://www.enn.ie/article/10124572.html
Some 35 percent of Irish internet users go online using a dial-up connection, far higher than the European average of just 12 percent.
That's according to the European Commission's 'E-communications Household Survey', which shows that although Ireland's PC penetration rate (58 percent) and internet penetration rate (49 percent) are on a par with the average European rate, our broadband take-up still lags behind. Broadband penetration in Ireland stands at 20 percent, well below the European average of 36 percent.