We, at AnimDesk, remembers the days when the only available animation sources were books like The Illusion of Life: Disney Animation
Nowadays we have newly improved technology that can (and has) reduced the production time vastly! Using tools such as: Drawing tablets, 3D Software, Digital editing rooms, painting tools, all of them which can separate the old school artist from the pencil and paper he used to sweat over with.
Although technology did create cost production to lower, this does not me that big studios forgot the old ways, and even today ,amy are going back into the paper/pencil combination to bring life into new characters.
And so, to remember the old times and how they fused into our 'modern' animation world, have a look at the below documentary for more detailed conversations and interviews with legends of the old, and masters of the present.