It is a massive benefit which we are fortunate to have can effectively travel all over the Island for free, well it;s not free, transport companies get paid by governments North and South, but over here we have no privatisation, all government owned.
We will be flying out of Dublin in May ( we do so regularly, just down the road and it’s a proper international hub so can fl most places with no need to fly into UK and onwards), as the other half has not reached pension age yet, but has hit 50 so has NI pass she has to pay for her ticket £17.60 return as we are crossing the “border” but I don’t. Given the Airport bus service to Dublin airport runs ever hour, not paying tolls , no airport parking or drop off charges,and they drop you outside the Terminal its a no brainer.