I recently (Sep) entered the US at LAX T4 on Adv Parole with my US Citizen wife. We both went through the US Citizen line. Did not get any problems, but as with all AP had to go through secondary inspection - which is pretty much just stamping etc... no questions to me or her. My experience is that T4 immigration is better/easier than TBIT.

We also flew into DFW together in May - but we were first off the a/c and there were no lines anywhere - in fact I don't think they had US and non-US lines at DFW.

Luckily I now have my green card