I also enjoy the idea of a year round haunt. I'm just a haunt fan in general, and I was always happy I could get my fix at the old House of Horrors, even after many repeat visits. For me, half the fun is watching other people get scared, so it never really got old for me.
I do think the timing of it is a bit odd, as a "follow up" to Harry Potter. Seems oddly anti-climatic to me, even as a haunt fan. And I personally do feel Walking Dead is pretty overdone, but at the same time, it's always a very, very popular maze at HHN, and an immensely popular show with the GP... so I can see how they'd be justified in using it.