Just going to say that getting an intense burst of euphoric joy in this situation is not the standard reaction guys have. The gender bender genre would be as popular as the action battle genre if this were the normal reaction.
Doesn't mean you're not a guy though. It just means you have a strong feminine side. Whether that's a strength or a detriment is only for you to decide. And what that side ultimately means to you, though I think exploring how far that rabbit hole goes is good for you. There's no such thing as harmful thoughts and beware anyone who tells you there are.
The T-word only comes into play if the thought of being the opposite sex is so overwhelmingly positive that you absolutely would benefit from completely changing. The reflexive hostility you see on the topic is meant to keep people from going that far, even though a rare subset of people would be happier if they did.
In the late 90's on the internet, we used to use Ranma as a litmus test. Would you want his curse? The answer was usually very telling. ("No", "Hell no lol", "Yes, if I could have more control over it" or the rare "Don't tell anyone but I'd probably stay a girl almost all the time")