Earlier quoted context omitted.
I love vim but admittedly ctrl-backspace-backspace is just as fast as d2b and works in nearly any editor. The stuff i really like is stuff as dt. which will delete until the end of the sentence, ie until the period. Or di( which deletes everything inside the parenthesis.
I decided one year that I would force myself (a vi die-hard) to use emacs for everything for an entire year, to see if I ever got used to it. One thing that never stopped driving me crazy was that there's no efficient way to duplicate a line like yyp in vim. The closest I could ever get in emacs was ctrl+k k ctrl+y ctrl+y (that is, delete the line and then paste it back twice). Looking online for a solution leads me…
I think that's reasonably short (same number of non-modifier keys as vi!). Of course, if you find yourself doing it a lot, you can configure Emacs however you want.