I haven't had any warps from pine laminate doors, not even after two
years
on the soggy west coast.

Interesting, but can't argue with experience, as Swingman says. What
kind of pine? Finish? Do you heat in winter -- and dry out your house?
Where did you get them?

Nothing fancy, just the plain HD & Rona shrinkwrapped pine laminate
shelving. The doors were dyed and sprayed with lacquer. The doors are in the
kitchen, and subject to the occasional bit of humidity and kitchen heat. The
weather on the west coast doesn't really get all that dry in the winter.
Perhaps these conditions help to limit warping.