I would do a part-time ICU (or cardiac) fellowship in a heartbeat. I would even pay for a good one.
In the US, most if not all (surgical) residencies/fellowships are created to acquire cheap labor. Education is an afterthought, the same way it is with medical schools (which are more interested in research, not teaching). In what other country do people pay many tens of thousands of dollars/year to waste 6-8 hours a day holding surgical retractors and doing other menial jobs? How much can you learn when you are so tired all you can think about is the countdown to the end of the day/night? Some fellowships are not much different. Thank God for the ACGME rules.
The proof for the slave mentality is the existence of much longer fellowships than actually needed to learn the craft. 12 months for regional, OB or neuroanesthesia? ROTFL. And why can a T32 research fellow receive a subspecialty diploma after working as a fellow just 1 day/week for 2 years?
I remember when my program tried to recruit me into doing an "ambulatory" fellowship - one tailored by them, not by me, according to my interests. When I said no way, I was offered essentially the same job as an attending, for 4 times the hourly salary. There aren't many fellowships that are really worth the $150-200,000 price tag, not to mention all the other sacrifices.
Excuse my rambling. Maybe I am getting old and cynical...