This is exactly my experience living in the south too.I can only talk anecdotally of course, but being from down south I can say 15 or 20 years ago non-enthusiast friends and colleagues would always be visiting and just knew of the park and major rides. Now it is much rarer, especially with my younger colleagues who seemingly haven't grown up with visiting through this extended rough patch. I'd estimate very very few would have heard of Wickerman or know where or what it is, where as a few years after they opened you'd have been hard pushed to find anyone who hadn't heard of (and probably ridden) Nemesis, Oblivion or Air.
You can bet that nearly every single one knows where Peppa Pig land is!! Certainly more than are aware of Cebeebies Land existing.
15+ years ago, I would always hear people talk about going to Towers. This is despite it being a 5/6 hour drive away. Now, I rarely hear it. In fact, out of all my friends/family, I know only one person who's been in the last few years.
But with Peppa Pig World, virtually everyone with young children has been there. They all call it Peppa Pig World too – not Paultons Park!