Earlier quoted context omitted.
This isn't Google's fault. In Firefox, if you type a non-address directly into the address bar, it automagically directs you to the top Google hit for that query. The real failure here is Mozilla, for releasing a "feature" that, as usual, appeals to computer power users, and royally fucks over computer novices.
It's much, much worse on the GTK version of Firefox -- inspired by the X default of mouse3==paste, on such platforms they make the middlemouse.contentLoadURL config default to true. This means that if you middle click anywhere in the window that isn't a link, it instantly redirects you to the "I'm feeling lucky" result for the contents of the last text selection you made. I cannot think of a single creepier usability…
You should try scrolling through large source files with a mouse that has a sensitive click switch on the scroll wheel. The number of times I've found errors due to random stuff pasted into my code because I pressed too hard on the scroll wheel. grrr
Please, please if anyone knows how to disable this, let me know :/