I guess another question I'd like to ask is whether you enjoy dual-n-back. I've tried it a couple of times and consistently disliked it precisely as I would dislike a cold shower.

Now that I think of it, there are many mental activities that I dislike precisely that way. (Or, at least, there used to be many; now there are fewer.) One of them is the Gunnery puzzle in Puzzle Pirates. To try to extract a general trend here, I tend to dislike things that require me to react quickly. I used to loathe such things, along with a host of other things: asymmetry, discontinuity, permanence. If I had been omnipotent when I was a kid, perhaps I would have replaced the world with a sphere.

Gosh, I was a really messed-up kid back then.