I also don't use one to melt snow. However, I don't use a standard canister stove for that- I use a Coleman Xtreme whenever melting snow will be part of the equation.
I limit alcohol stove usage to both snow and wind conditions. For example, I would use one in December for a low-altitude forest backpack without snow (here in the moderate temps of the Northwest) but I don't ever take one for mountaineering in the alpine zone- even in August. This is because of winds. I've never used a Caldera, mind you, and I hear that these are much better in high winds. But I still think that Camp Sherman at 11,000 feet on Rainier is not the place for an alcohol stove. For that location, i'd typically choose a canister or my Xtreme. (I don't use white gas anymore, but I would if I were going overseas).
So there's a long answer. Snow or extreme winds- no. I typically use one above 20 deg. and in moderate conditions.