I have perfect pitch. Have had as long as I can remember. Transposers on keyboards really screw my brain up. Capoes on guitars are not a problem for me though, probably because guitar doesn't have black keys and white keys. Perfect pitch is how I learned jazz chords not knowing a speck of music theory. When I went to college I started learning the science (or math?) of the complex chords I had learned from listening. I too can tell you a phone number from the beeps.

Something along these lines that has perplexed me. Why are horns in such stupid keys? Why can't all horns be in C? I understand they call whichever key is easiest on a horn the C, but that's just weird. I play tenor sax and it just is dumb that a concert F is a tenor G. That would be a symphony writer's nightmare! Especially if he has perfect pitch!