I love coffee. I drink it obsessively. I have an instant espressomaker at my house that dispenses coffee at the push of a button and spend far too much on it when I go out, so I generally run at like, 5-8 cups of coffee a day. It doesn't make me jittery or anything, but rather I find that it has a balancing effect on me and helps me think more clearly and have more control over my social mannerisms while I'm tending to one. So for example, I can take a sip every few seconds methodically rather than do something strange like tap my foot or bite my fingernails or stare at things. The end effect is that I will most definitely suffer from kidney stones throughout my life, that my daily routines are intimately intertwined with my coffee intake, that my eating habits are akin to those of someone with an eating disorder, and that I'm artful at introducing myself to people over coffee. It's a personality trait I see no point in changing. I can see fairly directly how it's led to more social interactions and limited what I spend on myself downtown, since I'm getting a 1.50-2.00$ cup of coffee generally in lieu of more expensive drinks or food. At least I'm not into alcohol or tobacco.
Of all the coffees I've tried my favourite is the coffee sweetened with condensed milk you get by default when you order it at asian bakeries in Chinatown. I also have some favourite indie coffeeshops downtown that roast lovely Kenyan, Ethiopian, or Summatran beans in house and brew them strongly. Coffee brewed by a friend is also lovely. I suspect that what leads to coffee being more or less appreciated has more to do with semiotics and context than flavour.
I like bringing coffee with me on the subway so that I will write, draw, read, or think on my trip home rather than fall asleep. I think that this is the most productive cup of coffee I have each day. It suits my solitary/ thoughtful personality.