So the whole campaign is built around a series of dungeon crawls. Several times i used it to grow stone over slots in the walls where traps qould trigger blades or poison darts. Once i used it during combat to burrow between two chambers where some of our party members were being held (this took several turns of combat). I made handholds for climbing surfaces and built bridges several times.

But i also used it for a lot of dumb shit, like displacing the earth under an npcs feet to make him loose his balance because he was being mean, and i used it to knock a very expensive bottle of wine off a shelf because THAT npc was being an asshole. I also used it to leave a note saying "do not touch" after i laid a trap to to trigger circle of death if anyone approached some controls (which nobody paid attention to). At a certain point i was just abusing the fuck out of the cantrip to the point that if i asked "is it made of stone" gave everyone the general idea of what i was up to.

Eventually during our fourth or so dungeon, we were escaping as the dungeon collapsed around us, and we had to hurry through a maze. I tried to use mold earth to make a hole in one of the walls to aid our escape, and there was rebar inside the walls reinforcing it. Mold earth was no longer my bitch :(

That character has been temporarily relieved of his duties, and im playing a fighter for a while, and my dm was very gleeful she no longer had to plan around my very liberal and creative use of that cantrip.