We went at Christmas and enjoyed it (with a 1, 4, and 6 year old at the time) but the booking everything (even the pool) was painful. It’s very British in that respect, they need to ease up on that.This is 100% exactly what it is for. There are big zip line things and big pool slides that dads could do, but the goal of this stage of life is mainly "get kids tired".
I was worried that they would see some of the cool stuff we hadn't booked and give out about not getting a go. Which they did a bit, but you can navigate that by shouting at them. It is a pretty mad set up, how rigid everything is. We'll go back once more I think, then it's on to proper Irish holidays of walking about random towns.