It is not, many people are saying this.
Personally I find other search engines (DDG included) quite impossible to use, the results just are not what I was looking for, while Google is an always first page hit. Engines like Bing just give me straight up crap which isn't even related to (seemingly ofcourse; it somehow did find a relation obviously) what I am searching for.
I use web search almost exclusively for compile issues, coding searches and whitepaper searches. I would like to use something else but it would be very inefficient for the work I do at this moment.
What I noticed as well (and is sommewhat related); I work in China a lot and my colleagues there have no (real; they have it when they need to but they don't use it like we do) access to Google and, when solving hardware/software problems they are far less efficient than us. Thye have an advantage (I find) that they memorize a lot more than we do, but when we just need to solve something that they did not encounter before, Google always delivers while Baidu, Bing etc do not even get close.