I haven't tried the 5 cut method, although it seems like a lot of people have. My issue with it is that I can filet a pike in under 30 seconds, wash the filets inside, put them in the fridge for a bit to stiffen up (which helps debone them) and debone them at the kitchen table where there are no mosquitos and I can take my time. I also think you lose more meat with the 5 cut method.
As for the line getting cut, it's funny but I run 20# Suffix 832 braid (often without a leader) and I can't remember the last time I got bit off by a pike. I used to use Trilene 8# XL all the time and even then it wasn't too often. If I do run a leader it's one of the titanium ones though.
SS