if you're still young, learn dvorak as soon as possible and when you're wise, you won't be crippled like these folks praising this keyboard.
On Dvorak, your fingers automatically drift back to the home row because of how the letters are arranged, so I found myself touch-typing after several months with no specific effort. Plus, iOS only has QWERTY, so the phone keyboard keeps me in practice enough to use QWERTY on off occasions.
Dvorak plus the Kinesis Advantage, for me at least, is the most comfortable combination. Speed is probably a bit slower than a flat keyboard, but it's about long-term comfort, not speed, when I type as much as I have to every day.
"The" requires both hands on Dvorak, and "th" is the easiest right-hand finger-roll¹, equivalent to "kj" on Qwerty. E is one of the strongest keys on the left hand.
On Qwerty, this extremely common English word requires moving the fingers away from the home position, and the T (second most frequent English letter) is one of the longer stretches.
Taking your most recent longer comment (Category Theory), typed on Qwerty there are 354 alternate-hand transitions. On Dvorak, there are 451.
With the simplest fragment, "there are even books about it", and the left hand shown in capital letters:
Qwerty: ThERE ARE EVEn BookS ABouT It.
Dvorak: thErE ArE EvEn bOOKs AbOUt It.
¹ Like when drumming your fingers on the table.
dvorak was optimized for comfort while qwerty was optimized for a mechanical device. dvorak is like shitting on a bidet and to me it's very strange that folks prefer to smear poop on themselves with paper.
Yes, apologies, my example was wrong and I was probably confusing Dvorak with another layout. I would like to see some better statistics on hand alternation though, because qwerty is quite good at this (as Wikipedia states) and it would be interesting to see where it actually sits relative to the other layouts.