"loop" can all be typed with one finger, as the letters are all together on the qwerty keyboard, and the "o" repeats itself.

"while" on qwerty is sort of a chore.

Usually for speed and avoiding strain you want to incorporate as many fingers as possible. In fact it's a common mark against dvorak online that "ls -l" is all typed with the right pinky (not an issue in the workman layout luckily).

Using more fingers allows for faster typing.

w TAB in a properly configured emacs