Look, Shibuya Crossing is one of those things you do because... well, because everyone says you have to do it. It's literally just a really busy crosswalk with some big screens on buildings. Sure, it's impressive how many people can cross a street at once without total chaos (up to 3,000 per light!), but after about five minutes, you realize you're just standing there watching people walk.
Think Times Square, but with better crowd management and more efficient pedestrian traffic. You'll take your photos, maybe shoot a video of the crossing from above, and check it off your Tokyo bucket list. Then you'll probably think to yourself, "Okay, that was... a crosswalk." But hey, at least now you can say you've seen it, right?
And yes, to answer what you're thinking - those photos you've seen online are definitely cooler than the real thing.