I always use it while developing a new web app, but admit that I always switch it to something "fancier" in production, mainly because I find alerts rather ugly. But, goodness gracious, it would simplify so many things! I've just sort of assumed that default browser alerts were considered a big no-no these days, but that assumption comes from the fact that I simply don't see them being used much. I guess I should look into this more. Sure would shorten dev times!