In my area we get poison oak instead of ivy. I have always heard that the oak is stronger, but have no scientific evidence.
Anyone who works outside has to learn to recognize the plant.
I always wear long pants & sleeves, no matter what the weather, shower as soon as I come in from any outside work, and never burn any of it.
I also keep away from other people's burn piles, you never know what they put in there.
If you are susceptible, I have found the pumice go-jo (not the slimy stuff) to be as effective as the special cleansers, and cheap enough for use every day. The other thing is that I carry disposable rubber gloves on the tractor, and if I have to relive myself in the woods I put them on before hand. Transfer of poison oak or ivy oil from his hands to his hoo-hoo is guaranteed to make a man miserable for at least a week.