Yes, I think so, but if I won the lotto, for example, it wouldn't take me long to quit so I guess deep down perhaps I don't! That said, I imagine it would be more down to the new and varied opportunities rather than a dislike of my job.
At times. I enjoy the freedom it affords me (I'm self employed) but dislike the pressure of not having anyone to pass the buck to. Ultimately though I can't imagine much better, other than if I won the lottery?!