I am curious what PICs each of you uses.

I use primarily 12F675 and 16F684.

12F675: great little chip with tons of features and is easy to use.
16F684: also each to use but more IO pins / memory means it can do more complicated stuff that the 12F675 cannot, like driving LCDs.
16F886: the bare minimum to drive GLCD.
16F1936: lots of features, and large memory. I just started using it and so far really liked it. It is likely my choice of chips for complicated stuff going forward.