What he means is that compared to the UK version, Poland is much more involved and you get to do a LOT more for a lot longer and at much higher speeds.
During my first trip out there my first turn was an 0530 departure from Wolsztyn in the dark. Howard (the main man there) took me to the loco, introduced me to the crew (who spoke basic English but not much more) sat me in the Drivers seat and basically pointed out the items of interest, gauges etc followed by "have fun!". I sat there for a moment or two taking it all in right until the quiet was broken by the Polish driver shouting "Odjaz" across the cab at me.
"Sorry?"
(loudly and more forcefully) "GO, GO!".
"Are you sure?"
"GO, GO, odjaz, odjaz!" (pointing at the regulator even more excitedly)
I gave the big red lever a heave and off we went, that was it - no induction, no instruction etc, just get on with it and very much learn on the job.
The crew will keep an eye out for signals etc and will tell you when to shut off steam if you don't know the road, however the rest of it is up to you. The more often you go and the better the crews know you the more you get to do, e.g. running round/coupling up etc which can be somewhat nerve wracking because the Poles don't wait until you're buffered up before going in between, they still walk in front of the engine and drop the coupling on as you clatter into the coach.
Also, you work to a strict timetable and the Polish crews receive bonus payments for being on time, therefore being late is severely frowned upon and invariably results in much spirited running to make up time.
Once you've visited a few times on the "branch" passenger service and have a bit of experience, you can then book the more long distance trains which are much heavier and usually involve a lot more high speed main line running, however the days can be long. The last time I was there I did the Blues Express (jazz festival) excursion which involved a 400 mile round trip and over 30 hours on the footplate in one hit save for a couple of hours in the middle snoozing in an empty compartment.
The largest locomotives I've driven/fired there are a PT47 2-8-2 as well as Poland's only surviving pacific, with the smallest being a handful of tank engines as well as some Polish narrow gauge steam - the latter is a whole different adventure entirely!
I've posted a few photos etc of some of my visits on the "Magic of Poland" thread here: http://www.rmweb.co.uk/community/index.php?/topic/79855-the-magic-of-poland/page-5