As with anything, writing or speaking is something you get better at over time. The more you do it, the calmer you get, the more muscle memory you have, and ultimately, the faster you can get things done.
But when it comes to speaking, I notice that there are people who’ve been speaking for years and they continue to make a classic mistake every time they start a talk.
Don’t get me wrong – it’s not a horrible mistake. But it’s done so often, by so many people, that it’s easy to not think of it as a mistake.