really? i haven't had much of a problem (edit: or rather, not much more of a problem than the process required to enter in the other country). but i've also never had much to declare, either.
Every time I've returned to the US, however, I've had to go through an exhaustive baggage screening and pat-down before I could even board the plane, and then stand in line for half an hour in Immigration once I got back, filling out an entire form to declare that I have nothing to declare, and answering random identity-verifying questions from an immigration officer. I feel tired and uncomfortable just thinking about it.
i usually get searched when entering a foreign country because i have snacks on me or something. i usually have very little hassle when returning to the US, never been searched (knock on wood).
Returning to the US you have to fill out that annoying form on the plane but other than that it's just a rubber stamp
Immigration "officer": Are you sure you still have your job at the bank.
Me: yes
Immigration "officer": If that turns out to be false we will kick you out like dogs