I recall not feeling particularly giddy about top surgery and I did wonder about that. Just from others' posts about pending top surgeries... well, they sound ecstatic. I was not looking forward to top surgery so much as looking forward to being fully healed. But a lot had to happen to get to that point: first safely driving 10+ hours in the middle of winter, getting to the appointments on time in a strange city, the surgery itself, then healing up a little bit, driving the 10 hours back, and healing for the next several months (while keeping fingers crossed that the final result will look OK and that there won't be complications). I felt... more a quiet mental preparation for all of that, instead of sheer happiness about finally having my chest fixed.
I got to feel the giddyness when I realized that I was healed enough to go swimming shirtless and that my new apartment complex had a pool.
Also: if something is going to happen that means a lot to me, I have a hard time getting excited about it. I'll be happy when it has actually happened, when I actually see it--until then, it's almost too good to be true. Geez, that sounds pessimistic, but it's true.