Agreed. The idea that there is supposed to be a 'right phase' is ridiculous. Of course you need to be aware how phase cancellation affects your sound, but it's a grave mistake to think you can achieve the "best sound" just by alligning the pair of microphones to 'perfect phase'.
But in scenarios with two microphones on an amp, I've found this plugin to be ridiculously handy..
http://www.airwindows.com/golem.html
Of course, as all Airwindows stuff, just AU.