My DH misses that ramp every time he flies there on his own -- but he's directionally-impaired at the best of times. Personally, I missed it my very first time there, but not again, as once you know it is a tight left, then you know to anticipate and get into position. It is a bit better now than it used to be; they added a lane the last time they rebuilt the road, so the traffic is not as tight and it is easier to get yourself in the proper lane.
(As for Ireland, Carrowmore is a walk in the park compared to Rosguill. When my kids were wee, they used to say that the best part of visiting the aunties was getting to "go on the roller coaster" -- the Atlantic Drive.)