It depends heavily on the field and whether or not they will work in a regulated field. All of my civil engineer friends go through the EiT and then PE track, but most of the mechanical engineers I know don't. I'm not sure how it breaks down for electrical engineers, both of the ones I know didn't do a PE.
I don't know the numbers but I imagine it skews heavily towards Civil. I was a mechanical engineer and the only reason I would have needed one was because I basically designed ships (from a regulatory perspective).
I'm sure there are people at places like Boeing, GM, and so forth who have PEs but I imagine it's a fairly small minority. It definitely isn't like passing the bar if you're a lawyer. I know someone who runs a fairly large systems engineering group in aerospace and they don't have one.
(And my understanding is that the software engineering PE exam has been phased out because basically no one was taking it.)
