I am extremely happy with my choice to do anesthesiology. I happen to be in the Eastern US, and supervise CRNAs and residents. Trained in cardiac anesthesiology and critical care medicine.
Counting medical school, training, and current employment, I've provided patient care in 15 separate hospitals, and there are problems in each and every one. But I still enjoy immense job satisfaction with the work that I do. Things that I think help me stay happy: 1) I'm okay with me being the only one in the room that knows I did a great job/saved a life, 2) from where I sit, I am incredibly fortunate that I make the money I make all things considered 3) I enjoy the diversity of my current work. Each of these things could be explained away, I realize, by saying "He's crazy/delusional/"drinking the Kool-Aid", but fu*k it, I like it.
If a wand was waved, and the sky fell, and all anesthesiologists were instantly viewed as equal to CRNAs, I'd make around $150,000 for 36 hours/week of work. I paid off my loans (and those of wifey, who is also a physician) in the first 11 months out of training. I'm good with $150,000. Might not be enough for everyone, but it'd be fine for me.
Regarding cardiac anesthesiology in specific, the technical advancements in echo equipment has been amazing, even in the very short time that I've seen them. 3D echo can literally be done with the single push of a button, and we may see the day where the surgeon says "Show me the valve", someone (anesthesiologist or CRNA or AA or whomever) pushes the button, and the mitral valve pathology reveals itself. Surgeon fixes valve, is shown the valve again, and off we go. Or maybe that won't happen. Where I work now, we were doing TAVRs alseep, introducer with Swan, 2nd introducer for pacer wire, and art line, then afterwards, to the CTICU. We're doing them with sedation with Precedex, an art line, and to the PACU postop now. Can't really predict the future, or what will change. In the past year, I've had ICU people tell me that they do cardiac "as well as anyone", and cardiac people tell me "there's nothing special about ICU training", and non-fellowship trained people tell me "fellowships are a waste of time and money". I'm not sure who's right. But I'm happy with what I've chosen, and am getting what I want out of this profession. It's already been said, but I'll say it again: choose what you think you can see yourself doing everyday. It'll most certainly become a job at some point, so hopefully you like that job.
Good luck. I'd pick anesthesiology again if given the choice.