...no worries coz I couldn't care less about MSA while being en-route.
You surely have to be a troll, cabin crew (no disrespect to CC intended) or an MS sim. pilot. A cruise is only a cruise as long as everything is ticketyboo. Even in a 757 which I believe never has to consider driftdown, MSA and "escape routes" are still an issue. So well before something goes twang, you really ought to have an understanding of what will be beneath you well before you actually need know in fine detail. That's why you have MSA/MEA/Route MORA on your flight plan and that's why you look at them before and during the flight.
PM