Yeah,
How much harder is it to be a engineer on a cruise ship compared to a ferry though?
To be honest the job itself is not that much different, a ferry still has all the same hotel services (aircon , fresh water, sewage, etc.), the only difference is that the expectations of the passengers is higher so if there is a problem with the aircon for instance there is a bit more pressure to fix it.
The other difference as chief engineer is that there are generally more staff to look after which is by far the hardest part of the job, if machinery breaks you can hit it with a hammer, if you hit the staff with a hammer it can lead to problems. Although I won't be going to the cruise ship as chief engineer initially.