>>4 It doesn't really "feel" like anything, even when it cracks mid-sentence. In general, it happens fairly slowly, and "cracking" happens because the voice hasn't settled into it's new range. It differs a bit from guy to guy, but very few people just "wake up" with a voice an entire octave lower.
Now this I know mainly because of voice classes in high school, both male and female voices break. Females, obviously, tend to be more subtle, but it still happens. Much like puberty in general, it happens sooner and ends sooner for women (the male vocal chords don't completely settle until somewhere in the mid-20s) leading it to be more obvious as a "male thing".
So, I started singing as an upper-alto around 10, my voice broke to a low-bass around 14, shifted up to a baritone around 17 and it's still there while I'm 20. That means that my voice isn't necessarily "done" and on very rare occasion my voice will still crack.