Go the other way.
Is it deep into the night or creeping into the early morning? Get out there and witness the different rhythm.
Is it raining? Head somewhere popular and observe its character in the state of desertion.
Is there an escalator? Take the stairs. They will be less crowded, you'll get some exercise, and probably get where you're going faster.
Are people burdened with luggage like pack mules? Pack light and go fast through crowds.
Are there massive lines? Skip them by planning ahead, going during a different time, or skipping the thing altogether. Sometimes the collective hype is just hot air.
Is everyone heading into subways and taxis? Walk, if you can. You'll see a fuller picture of things.
Do people unquestionably believe something? Double-check if the wisdom of the crowds has true wisdom.
Do you unquestionably believe something? Ask yourself what it would take for you to change your mind.
Go the other way.