Dvorak, a superior keyboard layout
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I switched back after a couple of months for a two main reasons:
1. It became hard to use other machines. A friend's computer, a significant other's computer, and others became hard to use and my machine was hard to use for them.
2. Keyboard shortcuts are designed with Qwerty in mind. You either change the shortcuts in almost every app, or you wind up stretching fingers for shortcuts that are now super awkward.
The typing was great, but in a way, typing is about more than just, well, typing.
vim, is also especially awkward in its movement commands. ST IMO doesn't have this same level of awkwardness.
The Dvorak layout is ideally suited to typing in english where you have a constant switching of vowels to constants. All the vowels are on the left hand so the idea is that you alternate and it is unlikely that you will type much more than 2 or 3 in succession and often only 1.