1 and 2 - yes to all. It does get mundane and boring, but the routine and pay is good.
If you want to fly with your hands and feet on the controls - do something else. Offshore flying is almost all procedural and is in that sense very similar to flying airlines. You are not allowed to do anything approaching challenging yourself and your abilities in terms of handling and rightly so, as it would scare the **** out of your pax. How would you feel if your airbus you were traveling on to Majorca suddenly started doing aerobatics of some kind? There can be times when it is more challenging but this is in decision making generally and not handling. SOP's these days are about keeping the pilot off the controls as much as possible and letting the autopilot do the work.
I have generally noticed, although not always the case, that the people who are most satisfied with the job (myself included) are those who have got all the fun and scary flying out of their systems already through either the military, utility flying, HEMS or other more hands on flying jobs. They don't want to scare themselves anymore, don't want to play with the aircraft and "wonder how this would work out" and the challenge is to come to work and get the job done as safely and in the most boring way possible.
Just be aware it is not flying as perhaps you would like or imagine, it is very much systems management, and that too can be a challenge, but not in the old school way.
Good luck with you chosen path.