DDG is "close enough": Add "!g" to the search and you end up at Google. So I often use DDG first, and then fall back on Google afterwards. My search bar defaults to DDG. The many other shortcuts like that (e.g. !gi for google images, !b for bing, !gn for google news; and tons more) is a good incentive to stick to that default.

Google still gets lots of searches from me, but the better DDG does, the less it'll happen.

DDG is mainly Bing, so you can just stop having/using !b

They have very different interfaces, so there are times when !b is worthwhile. Not generally for the results, though.