This behaviour bit me in the ass in work today. Had a new Mac, just installed Polycom (our video conferencing program), typed Polyc<enter> out of habit in spotlight to launch it, ended up on the wikipedia page for polycystic ovarian syndrome...
(Call me crazy, but because of this I've come to not mind the basic Windows 8 start screen. It's not as good as the classic start menu, but compared to the Windows 7 one you can at least arrange it for quick access to a larger number of programs.)