Like the rest of you, I'm happy to know that I didn't hallucinate seeing this show. I don't know if it was during the show opening or maybe during promos for the show, but I distinctly remember and eerie, echo-y voice saying "WOG" (vocalizing the W.O.G. abbreviation of "World Of Giants"). I also remember as part of the show opening, a pov shot of the bottom of a giant shoe coming down--as if you were being stepped on. I can't recall many specifics or details of episodes but I have a vivid sense-memory of being weirdly affected by this show--so much so that to this day, just the title makes me feel a little odd. It was a great show that was really kind of disturbing and off center, and it definitely gave me the creeps (in a good way) as a kid. I haven't seen of heard of any episodes being available anywhere, but if something ever turns up, I'd be really excited (and a little nervous) about seeing it again.
Review of World of Giants
