I agree that the behavior of a bunch of little retail traders has little effect on running price, except in very low volume periods such as NY lunch hour.
However, a bullish hedge fund manager isn't going to slap on major size all at once and even if s/he was inebriated and decided to do so, it would likely be at a price zone that indicated value. I've heard interviews with farmers who have to use futures to lock in their prices and they say they use price charts to do this!
Reading price action is choosing to trade at levels where many "large eyes" are seeing potential value. If price sets up a pattern that tends to result in a directional move
more often than not, you jump on the wagon and hope the ride isn't too bumpy