So you've enjoyed the sights and sounds. You've enjoyed learning about the history. You even have eaten your share of Japanese food at a tabehodai (all-you-can-eat) and chased it down with nomihodai (all-you-can-drink) at your local izakaya. It is time to visit the porcelain throne.
To pee or not to pee, that is the question. When nature calls, whether you are in Tokyo or in your home country, sometimes waiting is not a pleasant experience. But be fore warned. If there is a long line and you get motioned around people to go ahead of them, you may be ushered into the often only open stall... the one with the Japanese style toilet. What we gaijin refer to as "the squatter" because that's what you have to do; squat.
Better have those thigh muscles toned because not all of them have handles at the right height for you to grip and not fall over. Even most natives will try to avoid them if they can so if they let you cut around them in line, that may be why. You can do it if you must, its really not as hard as it looks, but be prepared to be intimidated at first. Things I learned quickly that you may want to know before hand: face TOWARD the hood/pipes/toilet paper, if you're wearing pants you should hike them up to avoid splashes, if you have long hair like myself you should not bend your head down to make sure you're not splashing, and aim for the center of the trough.
If you are lucky enough to have the Japanese version of the Western toilet with all the fancy bells, whistles, massage seats, blow driers, bidet, and deodorizer enjoy it. Take that puppy out for a test drive. As they all can very in amenities and button placement I can't give too much definitive advice on them. All I can say is when I first used one on my very first trip to Tokyo, after a very long 13 hour flight, when I woke up in the middle of the night to use it I just about freaked when I sat down and the seat was hot. In my haze I though that someone had been in my room and using my toilet (a'la Goldilocks and the Three Bears) moments before me, hence the hot seat, so it took me aback a moment until I woke up a bit more. Other than that, I quickly fell in love with these Japanese versions of Western toilets.
Here is a picture of my own porcelain throne at home with its bells, handwashing station, UV/LED lights, whistles, and heating seat.