I had the bathtub filled with water waiting for me when I was done. I've learned to work quickly and then immediately soap off thoroughly to get rid of the oils - that minimizes exposure.
I grew up in upstate New York and did a ton of camping and hiking when I was a kid. Poison Ivy is a very common weed there, and I never, not one time, ever had a single reaction to it.
OTOH, if I get within a football field distance of Stinging Nettles, my whole body goes into paroxysms of pain, ready to shutdown and I'm miserable... I mean ready to jump off a bridge miserable.. for a couple days. I don't think it's an allergy, just a really bad reaction!