The _really_ scary thing is that as rates are moved close to 0, inflation seems to slow down. This is true both in the US (almost 0 rates, low inflation) and in the EU (a bit higher rates, but almost 0 inflation in the last few months). If deflation kicks in, then this flood of free money will evaporate very quickly.
Deflation does not mean spending money is a bad idea. If I have $100 and there's 10% deflation, in a year, it's worth $110 of today's dollars(or some other number because I can't math, but in that general direction). But if a company is experiencing 100% growth and is worth $100 today, it's still a good investment (if you can sell it in a year).