It really depends on who you ask. Wine is a VERY objective experience, and, admittedly, a lot of what people get out of wine may be in their mind. Frankly, I think the altitude thing is in your mind. I also think lunar cycles are in people's minds. Type of grape, soil quality, air and water quality, spices, length and type of storage, etc. all can play a big role in the taste, but some people try to pretend that if you smile at the wine before pouring it, you'll have a better glass of wine.
If you're in a higher altitude, just let the wine breathe a bit more as there's slightly less O2. The nice thing is that the wine can stay out longer, so long as the temperature is reasonable (just below room temperature). I don't think, from experience, that the taste will be effected so long as it breathes first.
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