Having been to a number of libraries and used a number of their
  electronic card catalogues.... there's a HUGE variety... and
  they're often very confusing to navigate.

  Now I'm lucky here. Where I am, they all use the Dewey Decimal
  System.

  I also happen to have it more or less memorized from years of
  experience. I can just go in a library and find a book that's
  more-or-less on the subject I'm curious about. I get a 'feeling'
  that it's somewhere between 350-400 for example, and zoom into
  it.

  Could I tell you right now what's in the 350-400? No. But when I
  had a topic in mind, that's when I get the feel for what area
  it'll be in. We have a number of libraries in town with
  different books and different configurations and it works.

  I suspect if I was in a library that used another cataloging
  system, I'd be lost for bit until I understand their schema.
  Thankfully they usually have it posted somewhere.

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