Does anyone regret going to graduate school?

Is anyone out there regretting having go to graduate school, whether it was that you didn't like graduate school period or whether you thought you picked the wrong program or you regret having gone to graduate school too early? Does anyone out there have a job that isn't particularly related to their graduate degree -- a job you could be doing with just your Bachelor's even though you have a Master's or more? Specifically for any engineers out there, do you have a job and a Master's degree that doesn't really have anything to do with the area you work in? Thanks.