It hasn't happened to me. I started coding in 1982; I'm still doing it. In the meantime I've started four startups (none of which succeeded - I'm a much better geek than I am a businessman - and done a couple of management jobs. But I find I still prefer writing code (and designing systems) to anything else, and I don't at all enjoy being responsible for seeing that there's enough money in the bank to pay other people's wages, so these days I'm just a contract programmer.