I always drink them because my OCD would not permit me to leave a stone unturned. I have the same problem with traps and will almost kill myself trying to disarm them.
^ That's exactly like me lol... yes, I know there's a good chance that acid gargoyle trap is going to kill me. No, I cannot leave it be. =P
Depends on the situation. Normally I do. Sometimes I just don't feel like wasting a turn on drinking it. The benefit is usually just so small, that I don't really see why I should.
Always. Did the same thing with the goat shrines in Diablo even with the odds stacked against me. Can't resist a gamble.
Were you raised by wolves? I bet you talk with your mouth full as well. Show good manners and drink quietly from the fountain. What's that? You say the fountain was filled with acid? Don't be a drama queen, suck it up, show some manners, and thank Krong, the Lutefisk god, and Inconsequentia for the opportunity to clean the blood from your sword and the plaque from your teeth.