I used to get it when I was little (never severe, though). Now I may get one or two little blisters if I rolled around in it. I'm usually fine to walk through it.
My hubby on the other hand is a different story. He didn't get it much as a youngster, but now gets a bad case of it at least once a year. Just two weeks ago, he had to go in and get a script for Prednisone to get rid of it. He usually gets one spot somewhere on his body that just oozes and oozes severely and has to go it because it won't clear up. This past episode, he was clearing some weeds from an area -- hoping to have a separate pumpkin patch this year. There was even a little snow on the ground still. We pretty much know where the poison ivy is around here and I have never noticed any where he was working. Well, there much have been some because he got it. And it would have been dead from winter, but I know you can still get it in the winter, too -- as long as you get some of it's nasty oil on you, you'll get it. When I called the doc's office to get him in, they didn't believe me that it was poison ivy because there was still snow on the ground. They believed it when they saw it though!