Pros
I get to work with some of the brightest people in the world, which is a truly amazing experience. Being surrounded by this much talent really helps you to lift your own game. I also get to build software that is used by (very large number) of software developers around the world, and which impacts >1 billion of their users. That's just insane.
Kontras
That insane amount of impact also leads to crazy pressure when things aren't going right. The weight of the world will be on your shoulders. Are you Atlas? I'm not. It can hurt. You've also got to be incredibly careful not to try keeping up with everyone else around you, or you will burn out. Just accept that everybody else is likely smarter than you, and you've just got to do the best you can. Learn to say no sometimes.