we found that they were very much worth it...
no lines and no people....heavenly peace and quiet (relatively speaking to the daytime july crowds)...and the park is really nice at night...
as for the name, that's correct....it harkens back to before it was pay one price.....you paid money and got a packet of tickets: A, B, C, D and E....(the tickets were always good....you could come back with them another day)...
the A rides were the transportation rides on main street (the bus, the horse drawn carriage)
the B rides were: i'm not sure - maybe the carousel and tea cups, but they might have been C rides....maybe this was the swiss family robinson?
the C rides were: fantasyland dark rides i think
the D rides were: the tiki room?, the TTA, the grand prix raceway
the E rides were: pirates, small world, haunted mansion,
i'm probably wrong about the breakdown but you get the idea...(it's been a VERY long time since i used those tickets....but i still have them somewhere in the house)..