EAGLE: how to find where the pin is connected - navigating fairly large schematics
As others mentioned in the comments, a best way to deal with large schematics is to avoid large schematics, by splitting them into many smaller sheets.

As to find.ulp, you are using it just right. What you must understand is that, every net segment is treated separately, so if you have something like:

    |
    |
____._____


find will yield three results for it. That is probably why you have an impression that results repeat. Anyway, you can browse through all of the results by typing RUN find NAME nand increasing n by 1. Theoretically, RUN find NAME + should let you browse through all of the results, but for me it works only in board view, not in the schematic. 

Also, try typing SHOW @ NAME, it will draw a rectangle around all highlighted elements, to locate them more easily.