As a dvorak user, whatever increase in typing speed is mostly irrelevant, for most of us, our output isn't limited by how fast we can type, but how fast we can think. That being said, a long time ago I took an analysis of one of our code bases, mapped every character onto dvorak and qwerty keyboards to produce heatmaps, and it's startling how much less the fingers have to move on a dvorak keyboard. So if you're lazy,…
Are you able to have all your normal keyboards as dvorak? I have thought about trying to switch. But I use a few different keyboards in my day and it would be a real problem for other people if the keycaps didn't match what was on the keyboard. I also think my fingers would get confused about what letter is where when switching.
For me the learning process was very similar to learning a foreign language. At first it was hard, but once I started to get fluency in dvorak, typing in qwerty was hard for a while...but then at some point my qwerty typing ability came back and switching between the two layouts is as easy as switching computer or human languages. (when you know them fluently).
To address your fear, yes, there will a period in the learning process where your fingers get confused switching back and forth but once you get past that it goes away and switching becomes second nature.