I should add that when you are boarding attractions, you just need to pay attention and hold up how many fingers you have in your party when it is time to be assigned a row. They have more CM's staffing the rides in general, and they almost hand deliver you to your row, especially for foreigners. You will be directed with broad hand motions and the English words for whichever row of area you should go to.
You don't need to learn the Japanese phrase for "We have two people in our party", just hold up two fingers with a smile and follow their lead.
Also, it's best to not try and bend the rules at all. You will be very politely reminded again and again not to take flash pictures, stand up, sit down, or whatever the rule is. If you do accidentally break a rule, apologize with a smile and just follow along, and all will be well.
At buffeteria restaurants, after you slide your tray to the register and pay, a hostess will take your tray and escort you to an assigned table. They delight in personally guiding you, and it really is best to just follow. We never had a bad interaction.
Be warned however, after three days in Tokyo Disneyland Resort (which is a perfect length stay) you will be VERY SPOILED and the lowered standards and lazy "good enough" service provided by the American CM's may be a bit of a downer for you after your Tokyo visit. American CM's think they are doing amazing things by simply smiling a bit, wearing their uniform correctly, and maybe saying something like "have a magical day".
Japanese CM's know the standards of behavior and appearance and hospitality for them are much higher, and they will attempt to exceed even their higher standards to impress a foreign guest. The Japanese CM's really make the American CM's look like a bunch of fat, lazy slobs, and that can get a little depressing when you think about it too much.