I never had a problem with orcs or trolls either, somehow the fact that they were so common and basically often just cannon fodder made them less frightening.
More unique creatures however did seem dangerous - for example the Watcher in the Water or Shelob/Ungoliant. I never really was a big fan of krakens or spiders.
And to honour our forum's theme, which kid wouldn't be scared after seeing this representation of a wight?
