Here's a good "trick" for getting past long customs lines. Always carry a small piece of chocolate or something that typically does not need to be declared (or if it does but is discovered is not likely to cause any issues. So no cheese or steaks. )

If the customs lines are long in the "nothing to declare" lines, then declare your chocolate as food. That line isn't usually long at all. When they ask what you are declaring, say chocolate. They will usually roll their eyes and be annoyed, but let you walk through.

Of course there are plenty of situations where ALL food should be declared, so then you have a choice. Ditch your chocolate ahead of time or take the chance that a customs officer will be having a bad day, discover it, and make an issue of it.