My Mercedes has heated mirrors that come on automatically when it's below 1C. I LOVE them! I often come out to my car (after school, gym, shopping, whatever) and the mirrors are frosted over. In seconds, they're clear. The Forester has 'em (as have all our Scoobs) and they work very well even if you have to activate them "manually." (Oh, it's hard work pushing a button)
As for variable wipers, the C230 has "normal" intermittent with one five-second setting. Doens't bother me at all. If I need an extra sweep, I just trip the single wipe feature. Barely even takes a movement of my finger. The Forester has varible ones, and I'm fiddling with the setting as the rain changes, but that's okay too. Either system suits me fine.
I like the rain sensor system (only used MB's) but, at least on MB's, it really increases the cost of windscreen replacement.
One "luxury" feature I have been spoiled by is heated seats. We haven't had a car without them for some years now...