I sometimes PL myself in the AE with my second account and even then rarely more than a few levels -- either the first few, the last few, or a few in the slog that is the 30s. I almost never PL from 1 to 50. As far as I can remember I haven't done that at all in HC, but maybe I did early on. Sometimes, if I am bored, I will log in a farmer to run a few maps. I find it relaxing once I get into a rhythm.
I don't mind if people want to PL to 50 or however much they want to. However, I do think that afk-farming, especially multi-box afk-farming may be a bit too much for me. I think you should be at the keyboard if playing. That's just my opinion.