Minimal if you don't drink, don't want to have a dedicated space for breakfast, don't like free galley/bridge tours and do like standing in lines to disembark
Priority departure is one of the most undervalued perks of being in a suite. You get sent right to the front of the line to exit the ship, and sometimes that can save you a ton of time.
Good to know. Last summer was a mess getting through customs because they took a few CBP agents to do a crew inspection. It took about an hour to get through customs.