It's not for everyone, but it really is a holiday that works for many.
Small, neat little cabins, that are solid, with decent bathroom and reasonable kitchen (apart from lack of oven - but does include dishwasher and a coffee maker).
In UK, the blackboard wall is fun for DCs to use ( and to leave notes to each other/write shopping list etc)
The roads are good because there is very little traffic other tha. Changeover day, and the traffic that,is there is very low speed.
The pool is generally good, and each pool is similar but has slightly different things to it (Sherwood had a raft ride, while Longleat had a different slide), but each has a. "Wild water rapids" and a large wave pool and good baby pool.
We've been 3 times in the UK and always said we'd leave to do things locally, and only actually left at the end of the week to go. We are in Netherlands th s week (after another event in the country last week) and its slightly different but we have gone out a bit too.
Dd learned a lot of independence in CP, going to the shops for breakfast items alone (by choice), which lead to a slow build up of independence at home to getting home from school by herself that winter, before a bullying issue meant that she needed to get home herself earlier in the afternoons while I was still at work.
We generally self-cater because we enjoy cooking together in a relaxed way. But we usually eat out once a day - sometimes breakfast, or lunch, or dinner, or coffee and cake breaks.
We spend a lot of time walking, often we have bikes as well (rented or our own, depending on other travel plans), and actually slowing down to read books and enjoy nature and watch some tv within it rushing to do loads. We do a few activities, dd is allowed one per day usually (we have it budgeted for), and so,me are just her with others her age, while others we do as a family (bowling evening, tree trekking, kayaking). It's great to have the range of things to do on site.
It is not a holiday for everyone. But it is always busy and we always enjoy it the years we come (4 trips in the past 9 years).