It is definitely more in line with other large animals, such as cattle or horses. I have not had to use a vet very often, but when I have, it's been because it's a train wreck, such as a prolapse. Some people also have to call a vet to pull pigs or other practices that I usually do myself.
I have also had pot bellied pigs, and had one that got attacked by a stray dog. It was nearly $400 to have him fixed up.
He had several puncture wounds and they ended up amputating part of his ear. It looked a lot worse than it really was. The bummer part was I had to take him to a vet teaching hospital (only place there was a vet who would see him) and it was after 5 so there was an after hours charge.
However, the sow I had with the prolapse ended up being nearly $500 for that vet bill.
I probably could have tended to the ear myself knowing what I know now. As for the prolapse, no way. That had to be done by a vet. I raise show pigs, and since the sow was bred, it was worth it to spend the money on her.
Bottom line though, it's not cheap to have a vet work on pigs usually.
I can't remember a problem we have ever had with a pig. Granted we only raise one or two a year (for 30 years) but I can say I've never called a vet for any of them.
We free range them with the sheep and they pretty well tend themselves. I'm sure if I had a large number of pigs, that could very well change but with a little care ours have done well. (KNOCK ON WOOD )