Well, yes, I'm sure there are loads of testimonies like that. In fact, I believe there's a whole page (or section of a web site....not sure) that's devoted to a lot of testimonies of our people experienced answered prayer *because* of setting up their "War Rooms" and "getting serious" about praying.
This is just my opinion---and maybe I'm extremely cynical--but that's just not my variety of Christianity. I know a few people that grew up with that flavor of faith---and they were let down (loss of homes....loss of jobs....loss of spouse to death....loss of child....etc) and since that was the only version of God they knew....they lost their faith in God in the process. We live in a fallen world---and I don't see it as probable that we're going to avoid awful things (not matter how hard or earnestly we pray). To me.....it's more about seeing good (which is all from God and His goodness) contrasted with the awful (and even finding some good IN the awful).