No. Just bluntly no.

I did try using Dvorak. I got pretty good at it. After about four months I could finally type as quickly and effectively on Dvorak as I could on QWERTY.

On. One. Computer.

I sit down at a friend's computer or a family member's? Newp. I use a phone or a tablet? Newp. I use a work computer (where I'm not permitted to install my own software)? Newp.

So that's four months of reduced capacity to type, plus having to keep QWERTY in my muscle memory anyway (with the attendant confusion and error rate that causes!) all for ... not really getting much more speed than I was able to do with QWERTY in the first place.

No. Just because I'm not always able to use my own device. If I use other layout and have to use other's devices (e.g. library computer), I will be confused with normal QWERTY layout.

I do.

I use Colemak daily, it's much more comfortable and practical.

I maintain my Qwerty accuracy from time to time, because you always need it.

I see it like speaking another language, they each have their use