I am a developer working in ASP.NET MVC from the early CTPs at through to MVC4 at present.
For over a year, my .NET skills were blunted by the necessity of working almost exclusively in ColdFusion. Still, it gave me chance to get to know MVC a lot more through Mach-II. When ASP.NET MVC came out, I felt I had a good advantage, and had would have a stronger knowledge than if I had continued using 'classic' ASP.NET webforms.
I enjoy the fact that stackoverflow is more community based than Experts Exchange, which really makes users feel isolated.
Also, I've answered more questions in the two months here, than I did in five years at Experts Exchange.
Initially spurred on by the challenge of "doing better than Jonathon Bolster", I found that helping out is extremely enjoyable and helping people of all technical skill levels is great fun.
Please note that I am not currently looking for further employment. :)