My tuppence on the 1-2-1-2 versus 1-1-1-1 movement thing.
It is assumed that the 1-2-1-2 movement is more simulation and 1-1-1-1 movement is board game.
1-1-1-1 's merit is that it is far easier. Simple and less fuss.
1-2-1-2 's merit is supposed to be that it is a better simulation and more accurate. I differ.
1-2-1-2 movement does not take into account things like hesitation, reflex delay (stopping distance), stumbling, miss footing, decision making ability, micro-variations in terrain quality, movement curves, changing lines of sight and lines of free passage in an ever fluid and changing battle, etc.
Without taking all these other things into account the 1-2-1-2 movement has little or no value as a simulation aid and concetrating on such an anal unimportant part of movement is less realistic and more wargame/board gamey.
My point is this: 121, 111, movement debate is way way way down the list of why D&D movement (and any other RPG also) is unrealistic. If you can't fix the 100 or so other things higher up the list then I don't see why it is worth the bother of perfecting this.
It would be more realistic and simulational to ask the DM if you can move to a particular place and for him to adjudicate on the fly using intuition and guestimations if it can be done. This would, ironicly, be considered more storytelling than simulation, even though it would probably be better for both.