It has been about 20 months since I've started using dvorak instead of qwerty and it's time to share my experience.
The reason I started using dvorak was mainly for fun with a slight hope it would make me a better and faster typer. To be frank I am now barely any faster than I was with qwerty then, however I got another unexpected benefit. My hands are in less pain. You see before I made the switch I was frequently experiencing discomfort and pain whilst typing, especially near my thumbs. Since the switch however the feeling of discomfort rarely appears and I believe I haven't felt pain since the switch. So for this reason alone I am not going back to qwerty unless I'm forced to.
Before switching, I used to average about 80wpm on qwerty. The day I switched, as expected, my typing speed plummeted to 11wpm on dvorak. I believe the tools I was using then to learn dvorak was keybr and monkeytype. After about 4 days I was getting close to 40wpm, I reached 50wpm on the 6th day and by day 25 I was at the 60 - 70wpm range sometimes even getting to 80wpm. After a few more days I was finally back at 80wpm touching the 90s every so often. Soon after that I stopped practicing on the aforementioned websites. If I remember correctly I started using dvorak in the real world immediately, using qwerty only when speed mattered, which was really rare. I just did a few typing tests before writing this post and my average was at about 80wpm despite having a semi broken laptop keyboard (keycaps keep falling off while typing, 2 keycaps and their membranes [the little silicon buttons under the keycaps] have detached and I have to press on the pcb with my finger to type those letters).
Here are a few difficulties I had while learning dvorak. First of all using vim became pretty much as difficult as when I was first learning it. I looked into solutions for using the qwerty layout for normal mode and dvorak for insert mode but in the end I just left it they way it is and I believe that was the correct answer, now I navigate vim perfectly well. Another problem I had was that at some points I would forget how to type in qwerty. My brain would merge dvorak and qwerty to a point where the text produced by my fingers wouldn't make sense. Now I can type in both qwerty and dvorak but my qwerty is extremely slow. I am sure though that if I practice it I'll get back to speed pretty quickly, I just didn't have a reason until now so it kept getting atrophied. The only major problem with this is that now using vim in qwerty is impossible. I can still use public computers in qwerty, but if I'm going to be accessing vim through them I'll make sure to change the layout to dvorak first though, thankfully this has been super easy for both windows and linux computers.
Now would I recommend anybody to learn dvorak? Yes I absolutely would, I have heard from others that dvorak helps with pain and discomfort and I can confirm that's true from personal experience, some say they became faster, I didn't, maybe if I practiced with speed tests for longer my experience would have been different but who knows try it out and see for yourself. Plus now if you walk away from your computer, very few people will be able to type on it, until they see that the keyboard layout is not on qwerty and they change it (they don't know how to do it on my linux machine so it's bulletproof muahahahaha, I use arch btw 😏, you could even pull a prank on your classmates by changing the layout to dvorak for all the pcs in a lab and watch as everybody struggles to login)