We were at MK one Easter Sunday (must have been 2, 3 years ago now) and saw a woman and school-age boy try to get on the tram as it was driving away... if I recall, the woman got her feet run over or something like that, and the boy was all scraped up. I said to my husband, just wait, they'll create some sort of giant metal cage around the trams to prevent this from happening in the future.
I actually thought the doors weren't a bad idea... I've felt a little nervous on some of those sharp full speed turns they take. I did see some families struggling with their strollers last week at AK, since the doors are sort of spring loaded and keep trying to close while you're loading.