Based on what I've seen watching FTB and Tekkit videos the modpacks don't disable vanilla crafting recipes, so players would be free to choose their own play style and the extent at which they take advantage of the content added in the mods. In vanilla minecraft I don't make much use of redstone, while other players like to build complex redstone contraptions.
The resource gathering machines in FTB and Tekkit require a lot of materials and infrastructure in order to build and use. Quarries, for example, require gold and diamonds to craft, and then need engines to power them, pipes to transport the mined materials, and furnaces to smelt the ores into ingots. So you still have to put in a lot of effort and do some vanilla mining, but then the process of mining is automated so you don't have to spend hours on end monotonously mining cobblestone in order to build anything large. Personally I think the process of building the infrastructure looks like fun in and of itself.
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