I worked at a BigCorp and it was one of the worst years of my life. The work/life balance was awful, and the pay was shit compared to the hours I put in and satisfaction I got out of the job. All other experiences I've had have been much more satisfying.
On top of this, people think BigCorp is a safe bet where a startup is not, but BigCorp lays people off in large swaths all the time because their stock price moves a millimeter in some random direction.
My team was acquhired as a "startup within a larger company!!1" which ended up meaning: lower pay, longer hours, no equity, no actual autonomy.
But I was young and foolish and, caving to peer pressure, decided against my better judgement to take the gig. After my 1 year cliff (and successfully launching the Editions app that they soon after shitcanned) I got the fuck out.
EDIT: keep in mind, my hours were a product of my specific team, and the fact that I was commuting from Santa Cruz to Palo Alto. It would have likely been a regular 9-5 on other teams, and I'm pretty sure most of the other people there had regular hours.
I once got a dressing down from my director because I took a PTO day after working 20 days straight. I am so glad I don't work there anymore.