I actually find the voice to text feature works quite well, and have written a page of text, and was surprised that I only had to edit about 4 words which it got wrong.
Just tap the microphone icon when the keyboard pops up... simples. I find a lot depends on the words used.. sometimes it will make quite a few mistakes, but overall it does a pretty good job, though obviously one has to acknowledge that utils like this will always have challenges. A lot depends how clearly one speaks, and how the words are actually spelt & pronounced. I think it's something I may use fairly frequently. I used it a few minutes ago to do a text list in Notes and the results were faster than I could type it, though I did have to edit 5 words afterwards.