Quote from Pent9
The Endermite is a cool idea, but the new minecart physics are horrible. I don't know what they were thinking when they come up with that. Does Mojang not know that minecarts de-railing at corners and bouncing back at hills is bound to break things? It's going to be a massive headache to deal with on worlds where there are large automated rail transportation systems.
I remember back in beta 1.6 3 years ago when they overhauled minecart physics and destroyed everybodies cart stations.
Yeah, people will get over it.