It's definitely helpful, and if you don't I strongly suspect you'll be raising your risk of RSI, which can be painful and debilitating.
That said, if the bottleneck is your typing speed, something is probably wrong. Earlier in my career, when I found the bottleneck was my typing speed, with hindsight I was doing too much - writing a lot of repetitive code that I should have refactored, making things too long-winded, and so on. The bottleneck should be your mind.
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