Definitely need some kind of Index UI. I spend all my time in dexplore on the Index tab because I usually know exactly what I am looking for and things are indexed in such a way that it usually provides a great experience.
In lieu of an index (for v1 at least) you could do some kind of type ahead drop down in the search box. That gives you both paradigms and lets us Index junkies tap into the power of a real search interface. It would also be nice to be able pin the type
ahead box in place and navigate to search results and help content in a frame so that I can quickly browse through related search results without the hassle of constantly going back (either via the back button or through tab management). If you implemented
this in such that I don't lose my search result context and can quickly click through different results it would be very much like the current Index UI in dexplore but miles better because the search is much richer.
If you could get these requests in for 1.0 (or soon thereafter) I would absolutely love the new system and this is coming from someone who really likes and gets a lot of use out of dexplore.