Once again, anything you have to empty poop out of is not a composting toilet (even if somebody said it was).
Gone2TheDogs, I wonder if the toilets you encountered could have had too many people using them? Composting toilets are rated for a set number of people. If too many people are using one, it cannot compost -- and if they insist on using it anyway, they WOULD have to empty it. yuck!
Poop does take a long time to compost. Enzymes, heat, etc. speed it up, but you are still talking about a year or two. With the right number of people using a toilet, it will not fill up in a year of daily use.