I read in another HN thread, that some Tesla owners have experienced "ghost braking," and have adopted the technique of holding their foot just above the accelerator, in order to counteract it.
When I read that, I made a mental note to slow down a bit if a Tesla gets behind me, so they will pass me. Usually that's not a problem, as I don't drive particularly fast.
I don't know if this is an issue with other brands of cars. My fancy new Subaru has never ghost-braked.