I have a similar story -- 5 years at a company where I ended up being bored and not caring about the work. But I learned a lot during those 5 years, and was able to take advantage of several opportunities that may not have otherwise been available to me.

And like you, I'm now at a startup, that I love (heh, most of the time), where I've been for the past 11 months. It's all about timing, I guess.