Sheesh, what does this topic have to do with this irritating old semantic argument. Folks, the words "transsexual" and "transgender" are defined on this site for this site; obviously these are not universally agreed-upon. But why does it have to turn into a big argument every time someone uses these terms AS DEFINED FOR THIS SITE?

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Nero, I totally agree with your observation of "gender euphoria." I think some cis folk experience it from time to time; think Brad Paisley. Mostly, it's closer to "euthymia," a nice SAT word I learned from my therapist -- a normal agreeable mood, with a generally positive outlook.
I'm definitely not euphoric most of the time about finally being able to live as a woman, though every now and then I have my moments of glee. Mostly it's closer to euthymia. Kind of boring, but nice.