Newfie, Welcome to the DIS. You will find lots of knowledgeable, friendly people here to help plan your trip.
In my opinion "worth" is a very personal thing. I don't think anyone can tell you if the HDDR is "worth" it. Only you and your family can determine that.
That said, we love it. You need to understand what it is and if that appeals to you, you too will love it.
The food is very good - not gourmet but it is not meant to be. It is good "Down Home" cooking chicken and ribs, corn and salad and strawberry shortcake, and beer, wine and sangria. It is all you care to eat. We think the food is great.
The show is full of singing, dancing, and lots of corny jokes. There is lots of audience participation and everyone can get into the fun.
We first went in the early 80's and have been back several times since.
I had the pleasure of going with my 2 grandchildren last year, as their father (my son) introduced them to a fond memory of his childhood.
Hopefully you will enjoy it as much as we do.