Like many things that are misunderstood it can be summed up with, "It's a Southern Thang, y'all wouldn't understand" I like exciting, explosive events as long as they're planned. I have a buddy with an 8# black powder mortar he built, he shoots it during the Spring and Fall. It's really fun except trying to recover the concrete projectiles (we usually just make a half hearted attempt).
Explosive welding (according to the some show I saw) is used to join very dissimilar materials together. I think they use it to make up a lot of the armor plating in current use. Really neat to watch..