If you did not buy or use any of the products you listed, then it did very well have an effect. Of course that's pretty worthless in the big picture if a hundred bazillion other people were still using or buying those products. OTOH, did "pirating" Starcraft, Diablo or Visa help in any way? Did that change anything beyond more DRM or more severe punishment?
If a boycott at least generates media attention, it sends a signal. The only way the big companies can respond to that signal is by offering a better product (or at least do nothing). Pirating sends a signal as well, but the way the big companies are going to respond to that signal is by adding more DRM or more legislation, because it is something they can fight (or at least they think so). A simple boycott cannot be fought with DRM or legislation.
In other words: you're the effing source of the problem! There'd be no countries blocking piracy websites or trying to enact ACTA or any similar such actions on a governmental level if there was no piracy to begin with, yet you could still influence the market by simply not buying what you don't like.