Absolutely, my cousin did not have a medical aid, woke up one moring complaining of a very big pain in his chest, his mother suspected a heart-attack, but had to take him to Pretoria's state hospital [at 8am], they sat and waited until 4pm, round-about 2pm he had a stroke, and had some serious complications from this. Not saying the stroke would have been avoided, but had he gone to mediclinic or somewhere, I'm sure he would have had a better chance.
Then, we still have to gather a R100k for a 'life-saving' operation for him, or they could schedule it in 2 [yes 2] years... should he still be alive.
Even if its just a hospital plan, get one...