I switched to anesthesiology after two years of general surgery. That was about 10 years ago. It was one of the top three decisions which I made in life. Now that my wife and I have children, I am so thankful that I made that decision years ago. I do not want to give the impression that I have an easy lifestyle. There are still things with my wife and kids that I miss, but my lifestyle is much better than it would have been in surgery. I have realized no matter what, a job is a job. I am lucky in that I love what I do (I did an ICU fellowship and practice 100% ICU), but most days that my alarm goes off...I would rather snooze and hang out with my wife and kids. As a surgical resident, I realized that even on days when I was operating, when my alarm went off...I wanted to snooze and not go to work. I cannot speak for everyone, but anesthesiology and for me, especially ICU, have enough variety, intellectual challenges, intensity, and procedures that I am never bored. Do I miss big operative procedures? Absolutely! But there are a thousand other things which I miss in life...playing sports in high school and college, 12 o'clock classes in college, opening presents as a child on Christmas, etc. Does that mean that I want to go back and be/do any of those things...no. Am I less happy because I no longer play competitive sports...no. That was my past. In my mind, those two years of surgical residency are a memory like any other memory in life. There were some good times and bad times in surgery.
I have a neighbor who is a surgeon. He works all of the time and gets paid terrible money for the hours he puts in. He never sees his children. He is miserable. His wife is miserable. When I go to their house, his little kids think that I am dad. I try to put myself in his shoes sometimes. I cannot imagine that life anymore. There is no procedure which would satisfy me enough to wake up when my kids are teenagers and realize that I missed their childhood.
As to the person who mentioned anesthesiologists who wish they had done a surgery residency, I too met a few of those. Of those people, though, not one had actually done a surgical residency. I have met quite a few people who switched from anesthesiology to surgery, and not one has ever regretted the decision. I have met many many unhappy surgeons, though who never see their kids and lament the pay for hours worked.
If you are even thinking of making the switch...make the switch. You will not regret it.