No, I don't find it to be useful. Prices change thanks to increase/decrease in value and speculation. We can couple the value aspect to 'fundamental analysis'.
Speculation is (generally) a random process. A lot of people use technical analysis to attempt to estimate what the next step will be in this random process.
However, as it is random, there is no reason why technical analysis should work. Oftentimes, the charts are adjusted to make it seem like it works (remember the parabolic BTC/USD graph that should _always_ be respected?).

There is one thing to keep in mind: if people base their decisions on these tools, it is more than just a measuring device - it indeed becomes a self-fulfilling prophecy. However, I've found this effect to be negligible in crypto.