First of all, a lot of our "money printing" is being directed towards assets as opposed to stimulus/kicker type giveaways. sure the Fed needs money to buy MBS, but don't forget they now own MBS at perhaps the peak of it's quality vs. spread.
Second of all, both left and right leaning economists who pride themselves on things like "the ultimate future" and "winning the nobel prize" agree that quantitative easing is the order of the day. This isn't about perpetuating some kind of wreckless economic gluttony, but rather the last ditch efforts to save a critically ill patient.
Third, there are ways we are similar and disimilar to depressionistic Japan. Their business structures were fundamentally different than ours and our "phasing in" of action steps has been different in both type and speed. So the results, in some ways may be similar, but in others, by virtue of the different frond end variables, should be different.