If you don't like that (like I do), you can also manually add it under Site Search using
I can definitely see this new search feature being useful though. The old one was already useful because (if you asked) you could have it visit each result and pull some data out for you and integrate it all together, faster than you could do the same manually.
It's often hobbled by robots.txt forbidding it to visit pages, though. What I really want is for it to use my browser to visit the pages instead of doing it server side, so it can use my logged-in accounts and ignore robots.txt.