Edit: Except I don't do mining. I disliked mining after being forced to do it to unlock a engineer. The new wrinkles just don't interest me at all.
S'funny, I've always enjoyed mining.
For me, it's a "process pride" thing; getting my jollies out of refining and optimising the way I do something to get better and better results.
Even so, it kind of annoyed me to be forced to do it to unlock an engineer.