It depends on what I'm searching for. If its an error code or something a bit esoteric around tech then google usually has better results, but for everyday topics the results are pretty decent, and they feel like they have improved over the years.

I probably do less searching than I used to, but the bang system really helps me search other sites much more effectively. The more common bangs I use are !w for wikipedia, !so for stackoverflow, !imdb, !gh, !tpb, !bm for bing maps, !bi bing images.

!sp for startpage is really nice to use if you want to have the Google results without the tracking. Edit: looks like this was already mentioned below. Whoops.

I don't have any figures to back this up, but I feel like I use !g about half of the time (it may be 70 or 20% as well since I have no data). I'm not free from Google then, but this reduced my dependency by about 50%, which is still good to take !

For anything tech-related or everyday information DDG provides more reliable results than google because it's less infected by sales and SEO-spammers.

For local businesses and really rare topics Google is better.

I was in the same situation. Switched over again a few months back. I almost always only need to use !g for rare results (and even there it doesn't always help). On the other hand bangs like !mdn (mozilla developer network) and !w (wikipedia) make things much easier.

I use Firefox "awesomebar" keywords so "w" for Wikipedia, etc. (I think Chrome has this too), so I don't gain anything really with DDG's keywords on most searches.

I use !s. Redirects it to Startpage instead. Google results, but it acts as a proxy.

On the homepage, https://www.startpage.com/, at the bottom it lists the security part a bit more.

I basically only use Google for movie listings, calculations, and restaurant hours now. The rare times I switch to Google for other searches DDG fails on, Google is no better.