Well, few people used them because nobody knew about them. They didn't advertise the fact they had these nights. You had to search out the info on them and then ask about them while you were there.
They also limited the ticket sales to 10,000 I believe (might have been 7,000) but I never saw that many people there during the nights I was lucky enough to be there for.
Of course, this was a rather expensive proposition for Disney so it didn't make a whole lotta sense, which is why I'm sure, at least in part, they made the decision to ditch them.
i loved using the E night tickets.
the last time i did them was back in june 2005.
the ticket sells were limited like you said.
lines were never an issue.
i do remember they had stand up signs at the entrance of the parks, around by city hall.
it stated the Enight event, price and the rides that would be in operation.
i didn't think it was too expensive for my son and myself.
i remember when they started out at around $10 ish and later went up to about $13.ish plus tax.
buses were never an issue of being overcrowded on the E night tickets.
at least, not for the resort i was staying at.