What’s it like working at a large tech company?

I’ve been working at startups or building my own startups and I’m just trying to get a realistic picture of if the grass is really greener. Is job security at a larger company real? What’s the pace like, I understand it depends on the team, but is it long hours and as crazy as a startup? Is there really that big of a salary difference (funded startups these days have pretty competitive offers). Is there really a lot of process that get in your way? Are your peers generally competitive or supportive? Thank you HN community for your thoughts and experiences