Scott,
Guess I'm one of those outliers you mentioned. I snap the thread when possible (would not recommend trying it when using Kevlar or GSP threads) because it is fast and efficient. And unless you are a commercial tier, the idea of "wasting" thread is quite absurd. Hook fatigue is not really an issue because you use lighter thread on lighter hooks anyway (although those 2XF dry hooks can be touchy), and if you are worried about the hook popping out of the vise, might be time to buy a real vise.
Most ties are finished with 2 3-turn whip finishes without cement, but it really depends on the pattern, where the fly is finished (i.e. where the knot is going to be), and my mood at the time. Had problems with a single 5 turn whip finish, hence the change. Less of an issue with double whips.
There are many ways to build a mousetrap...