Ive stayed at two dog friendly camp grounds, 7 mile beach holiday park (many times), and Mudgee Riverside camp ground, before being a dog owner and again since we got our dog. I can honestly say the owners on all of those occassions were very respectful of other guests, and you hardly noticed the dogs, they were all kept on leads and close to campers/caravans. Being dog friendly didn't influence my decision to stay at these places before I became a dog owner, but only makes them more attractive since we got her.
Some of the strong negative responses on this topic have surprised me, I wasn't overly fussed about dogs before we got ours and that didn't affect our enjoyments of our holidays at dog friendly parks, I dont know, maybe we've just been really lucky that we have only encounted responsible owners.
To us, the kids included, yes I am a parent of two young children, our dog is now a major part of the family and Im sure that there are many others that feel the same, and I'd miss her terribly if we had to leave her in a boarding kennel.
Of course it is all going to depend on how strickly the park enforce the rules, you are going to find the odd selfish asshole everywhere.
The point of my original post was "is the change in policy enough to get me over my dislike of Big 4's, I'd have to say probably not if some of the attitudes on this thread are anything to go by, I'll stick to independents or bush camping.