No way, do not have pet insurance and not ever entertaining the idea. From the prices others have quoted me it sounds like a huge rip-off. My dogs are healthy and I stack the deck in my favor based on the pedigree (I realize this isn't an option with shelter/rescue dogs, we took that gamble with Coke). We don't go to the vet unless we need to and I do my own heartworm preventative which costs me $40 per year for up to ten dogs and I only have 3. I can also get my own combo vaccinations which means the only regular thing I need an actual vet for is rabies, which is only required every 3 years here. I don't take my dogs to the vet unless there's something wrong with them and that has been rare, and even in those cases the pet insurance would have still been a total rip off. Nikon cost me about $300 last year with his foot problem but pet insurance would be costing me far more than that and it was a fluke thing. Because cost of living in west Michigan is so low, vet prices are sometimes 2, 3, 4 times less than what they are in other areas of the country. If I have a major emergency I can't cover out of pocket, I'm comfortable opening a line of credit and paying it off within a year.
Also because my GSDs are high level sport and possible breeding prospects they are basically "warrantied" (not common in Europe, very common in the USA) so if one turned out to have a genetic problem, he would be returned to the breeder, neutered, adopted out to a pet home, and I would get a different dog (or, if you're really attached already as I probably would be, you can usually neuter and keep the dog with the problem and get another puppy in addition). Nikon has a genetic problem but it does not effect his ability to be a high level dog or breeding prospect, plus I really love everything about him. So far Pan has been perfectly healthy. Nikon has OFA certified hips and elbows. Pan has hips, elbows, and dentition certified in Germany.
They are pretty much in the clear so far for the common genetic health problems that effect the breed. There are some other things that could still happen but these things tend to occur later in life and tend to present quality of life issues, so not all the money in the world really matters when it comes to making that decision. While pet insurance might help mitigate the costs of treatment/management, depending on the dog and the condition it might not be something I'm willing to even treat.
I do not agree with the current state of health care for humans in this country so I'm not going to support the same model for my pets and let more insurance companies rip me off.
I do have liability coverage for my GSDs as part of my homeowner's insurance though!
I've considered getting an additional umbrella policy but with the temperaments of my current dogs it's not necessary (they aren't going to bust out the door and eat someone).