This is a fascinating discussion because I, too, find cilantro soapy-tasting. However, it doesn't taste soapy to me in small quantities. I also have a different reaction to dried cilantro versus fresh. I can take much more dried than I can fresh.
On another vein, I have been allergic to cooked carrots since I was an infant. It's only been in recent years that I've been able to eat cooked carrots in limited amounts. Not sure what that's about, but my father (a physician) surmised that there was a chemical change in carrots when they were cooked that caused me to react. Goofy thing is, I really, really like cooked carrots. Go figure.