I think you're either missing the point or are not utilizing the strategy properly then. I believe Sirprim can attest to the potency of Indexing (or at least I think it was him). I played him the other day and my first Indexing followed up by Maker's Eye cost him 6 AP, and my second allowed me to trash an asset and forced him to start drawing out of paranoia rather than clicking for money, which he desperately needed.
Firstly, the information gleaned through the access is invaluable, as it allows you the opportunity to counter the cards in advance, and can reveal the corp's core strategies.
Second, it allows for sabotage in that you can place what the corp needs most last, be it econ denial or ice denial.
Third, it allows for agenda grouping, which makes multi-access that much more potent.
Three Indexing means 15 cards accessed: almost a third of the corp's deck. A third of the total agenda points is 7, and in a given game, the runner typically will draw 2 of 3 available indexing by mid-game. All that's left is to build around such a strategy, and luckily Indexing requires less set-up and strategy sacrificed than, say, R&D Interface.
For my personal deck, Indexing complements Crescentus, Paricia, Maker's Eye, and Stimhack. It's probably in my top 3 MVPs.