I give the players very generic descriptions of the areas they're passing through, using non-specific descriptors like long, shallow, huge, high etc. If they want more exact dimensions, they have to actually survey the rooms (in character), which takes up a lot of time of course, and they seldom bother.
For miniature use, I draw out the relevant area myself on a perspex sheet laid over a hex-grid on the table-top, and erase it when we're done.
My own GM maps are mostly very schematic these days; I used to draw exquisitely detailed maps, but I came to realise that I was wasting a huge amount of time on stuff that nobody but me would ever see. (Likewise with my campaign world -- I used to create incredibly elaborate back-stories and world details, but realised that nobody ever took any notice of them even when they were relevant. Now I just make vague, general notes and fake it if I have to).