If others = Opera, then yes, they came up with that first :)
I've been using those kinds of keyword search shortcuts for years before switching to DDG by default.
The realisation was that having 100s (maybe 1000s already) of easily-guessable search shortcuts pre-programmed with DDG's !bang syntax is way more useful than having top configure 10-20 of them by yourself (and forgetting most of them when you reinstall a browser). Definitely worth the extra "!" keystroke and redirect :) [especially given DDG doesn't track you via that redirect].
