I know quite a few people who have worked at the same high tech company for twenty years or more.
Most all the tech companies like Lockheed, Raytheon, etc did away with their pension plans in the early 2000's. So there are a few people hanging on for pension plans, but not that many.
My wife worked for a local Gov't that did away with a pension retirement plan, but instead, matched employee contributions into an 'IRA like plan' that has a guaranteed interest rate of 7.5%; that's actually pretty good, because the stock market swings don't affect her.