Greenstone.Walker
Adventurer
Keep the initiative running - don't stop and reroll.It doesn't work that well. When the door is closed, both sides just sit there looking at it. When it opens, often you just have to reroll initiative.
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It doesn't lead to fun play.
If the players have their characters just look at the door, not opening it, have the characters hear muffled voices, moving furniture, sounds of running, and so on. Just because the characters stand in the passage doing nothing does not mean the monsters are doing the same.
As for fun play, I'd argue that the rogue opening the door and retreating isn't fun play. If the players want fun play then they need to do fun stuff for the GM.
However, I think the best answer is not to use large creatures in a medium sized complex. If there are large creatures then there should be large passages. Which is a clue to the players.
GM: The passage you are standing in is wide and tall, much taller than something built for humans or elves. Whatever uses this passage is twice your height, maybe more.