Being able to spot price action formations is hard. William's Alligator is an example of using MAs to do it and there are probably many others - I've have tried a lot of methods. The formation that has always interested me is the Cup and Handle which is well documented and can signal a buildup of pressure before a break.
Completely separately I was interested in Ehler's Sinewave to indicate trend (credit Emini-Watch), but after trying lots of variations I couldn't get it to give me anything I could use.
My 'moment' on this one came when I went back to basics and dumped my MTF stuff and started looking at the chart with a simple set of Sinewave 'resistance' and 'support' lines. It was obvious that the breaks of these often happen at the end of cup and handle formations some small, some large.
Like everything it isn't a golden arrow, but I find these breaks (or rather a bias based on them) quite useful.
They really start to fly when you line up two charts on different timeframes or in my case BetterRenko sizes.