I will say I find the more the game moves from Theatre of the Mind, to sketch on a battlemat, to Dwarven Forge 3D scenery, the less likely the players are to embellish details.Only to a point: if those hallways etc. are being drawn out on a board (or, even more so, built with Dwarven Forge terrain pieces) and the players are placing minis to show where their characters are positioned and which way they're facing etc., then the degree of imagination required drops significantly.
That said, the use of such things also greatly helps unify the imagination among the participants.
You describe a room as say "a 15ft by 20ft kitchen", if it is just Theatre of the Mind, they might jump up on the table (which you haven't mentioned but can assume to be there), if you put Dwarven Forge stuff down, but don't include a table, they tend to assume one isn't there.
It also seems to be related to the rules, the more the rules detail the things you can do, the more players feel tied to doing just those things. I know from experience players use to improvise all sorts of actions in 2nd Ed when there rules weren't there for them, but now they seem limited to using feats or class abilities.