I used the little "pop" preview to search 'similar' images and also to see what keywords were getting me my results so that I could potentially "-" neg out unwanted results. For example, 'sheath' gets you a lot of sheath dresses and "-dress" doesn't always do the trick. Use case!+Corban Hoppins
The leaders in the search market were Yahoo and "MSN Search", which is what it was called prior to Microsoft switching to the name 'Bing' so that users could verb-alize the product easier. This was to combat people saying "I'll google it." They hope people will 'bing it' instead.
So Microsoft's search was not reactionary, but you're right...Bing... even down to its name... very much is.