I've been seeing more and more posts and hearing more stories lately about people breeding two animals together that they were unaware were het for anything, and getting a visual recessive trait out of the clutch (usually albino I think, as albinos are the most common).
I do think pedigrees are helpful, especially as we get quad+ combos and the exact genetics start getting muddy (and for animals with a visual recessive parent in their distant background) ... Somehow I don't really see people keeping peds on their BPs, though.
For one thing, AFAIK nobody really does it yet, so we'd all have to start from scratch which, well ... Doesn't quite defeat the purpose, but isn't as useful as having a multi-generation pedigree.
For another, these animals tend to change hands multiple times throughout their lifetime -- it seems folks often don't even think to keep or send the "paperwork" with het animals a lot of the time; I could see a pedigree very easily getting lost by the snakes' third or fourth owner ...