It all depends on who you get on with, and what type of work you ask for, either day work night work or tramping. Day night work might have a certain amount of routine, though you’d not be on the same run every day. Tramping gets more variety, but there will still be regular tips, as well as miscellaneous jobs, though this can be the same for day work.
As regard what the runs are like, unless you know who its on with, and someone else works for them it’d be hard to say. My experience of Immingham container terminal(exxtor), though not a regular up there, is pretty good, not the largest terminal, and the guys on the booking desk always seem friendly enough. RTG or top lift loading/unloading pretty straight forward.
For an idea of tramping on containers, a brief resume of last week.
Mon- start from my yard in Cambridgeshire- Del to Stone (staffs). Swap boxes at a Containers base in Oldbury. Trailer change empty for loaded Evesham. park up Brampton Hut.
Tue- Felixstowe tip & turn trinity. Del to Northampton. Trailer change Cambridge yard. Lift off London gateway. Park up Barking.
Wed- Barking empty box ex container base. Load Newcastle upon Tyne. Park up Blyth.
Thu- Tip & turn London Gateway. Hinckley trailer change loaded for empty. Lift off empty box Oldbury. Collect empty box Freightliner Birmingham. Park up Welford.
Fri- Felixstowe tip & turn Trinity. Del Wakefield. Park up Newark.
Sat- Run back to yard Cambridgeshire drop trailer wash tractor sod off home 
My tip, if you are in a position to night away, then take that, day drivers sometimes get pushed harder, what with them needing to be back, where as being able to night away, means they know you’ll just stop because you don’t care about getting back 
Dipper_Dave:
Box jockey work is considered fairly simple but there are a few things to consider.
Mastering port and rail head procedures.
Getting familiar with your trailer operation.
Not getting complacent, check every thing twice and take your time.
Treat every bend, roundabout, turning etc with respect and very steady as you will most likely have no clue what’s on board.
Simple daft mistakes are easy as the job can seem to easy.
Box jockeys are also the best reverses due to the variety of tipping and loading sites. Blindside back up mastery will save your skin.
All in all I enjoy it but as with any job the moment you get complacent Mr Cockup won’t be to far away.
Long tips give you plenty of time to get to know yourself. I practice tantric meditation a lot. 
The variety keeps it interesting for me one day you could be knocking around rdc’s the next a house move for a bored housewife in the middle of nowhere.
That’s some very sound advice, and some more circumspect advice too 