I joined in 2000, and was LR'd at the 17 year mark. Started in old TAC, the days of Beer and Cookies. The best job ever. Along the way, the culture definitely changed. When originally hired, you would post your questions on complex issues to an alias, and if you did not work through the recommendations of the technical expert; expect to be openly and mercilessly flamed. It was an incredibly customer and technical focused culture, but not for everyone.
Things changed, after a few years, so went to more of a business team. Still great times. Can 100% say so much of your time at Cisco depends on your Director and VP chain. Get under the wrong Director and VP, good luck.
Left at the 17 year mark. Miss the Cisco from the 2000s. Went back for a few contractor stints after leaving, but left them each after the quarter renewal; could not deal with how much things have changed (this was around the 2020 and 2022 mark).
What I find is the folks I worked with back in the 2000s, especially in TAC; would mostly in no way shape or form be at first tolerated at today's Cisco, due to their mindset of pushing to work through technical issues; and worrying about how people interpret their demeanor.
The tech world has changed, and permanently changed. Glad I was part of the crazy 1990s and 2000s. Some insane characters. Those days are long gone. Most of those insane characters, well we're mostly retired; and mostly multi-millionaires. Right place, right time.