As a kid that place seemed massive, as least the one I went to - this would be like mid to late 80's. It was a Chuck E Cheese, not a Showbiz...although I think a year or two after I was too old for it, it did become a Showbiz, then later a Pizza Time Theater.
Arcade games out front, about 12-14 of them. Beyond that was the dining area which resembled a school cafeteria, just with lower lighting and carpet. That's where the animatronic puppet stage was. I wouldn't say I was "scared" of them, but every once in a while when the stage was dark and there was no performance going on, one of them would like jolt up, open its eyes, and look back and forth or something, then go back to "sleep." That was just weird.
Beyond the dining area were the back rooms, which consisted of a small room with 4 or 5 more arcade games, then beyond that were the plastic ball pits, which were my favorites. Thinking about how gross that shit was is a little disturbing now, but at the time I couldn't have cared less.
The whole place beyond the front lobby/arcade games area seemed really dark. That sort of added to the atmosphere for me, really.
My friend's young brother had his birthday party at a Chuck E Cheese in the mid 90's - I went along and was pretty surprised to see how different it was. It wasn't the same location but it was just nothing like what I remembered from the one I went to. It was essentially one big room with a few arcade machines, a few ski ball ramps, small indoor tubes/slides for kids to crawl around on (nowhere near as large as the ones you see at BK & McDonalds), and tables to sit at while eating. No creepy animatronics, no giant pits full of plastic to jump in. Everything was well lit and it seemed too crazy with everyone packed in the same giant room.
Clearly, the dream was dead.
...uh, this may not make you want to go back there.