For me, the killer Google lockin is autocomplete-with-suggest in Chrome.

I've come to completely rely on Google suggest as I type search queries into my Chrome address bar.

I find that particularly when looking up API calls, I don't even need to execute a search, I just need to rely on the wisdom of what everyone else on the Internet is searching for.

Also, if just looking for the domain name for a company, you don't have to execute a search, just start typing the company name. That skips the whole results page, saving precious seconds hundreds of times per day.

I just tried switching to DDG and lasted all of 5 minutes because the lack of autocomplete.