OK, but tomorrow when I've forgotten that I've done this and I do a quick search, if the very first thing that comes up isn't what I want, I bet I switch right back.
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It's slightly different, but you can do almost the same thing with Keywords in the Firefox location bar, and they presumably could support the bang syntax (or whatever) as well.
If it was just my desktop, and for some reason it only had one browser, okay. Customization is always cool. But I use too many different computers with too many different browsers in too many different locations that DDG's !bangs makes this really convenient and portable, getting the fast browsing workflow I'm used to in just a few clicks.