Creative mode lets you spawn/build stuff out of thin air, control time of day/weather, it lets you fly etc, but as far as I know of otherwise you still have to follow the game rules. For example even if you are able to build without actually having the required materials in your inventory and you don't have to have a workbench close by, it still doesn't let you build inside specific areas or create workbench extensions without actual workbench being there first. I'm pretty sure I once tried to put workbench inside a dungeon in creative mode and it didn't let me do that.
I got my mods from Nexus: Plant everything, NoStaminaCost and Build Restriction Tweaks.
Even though creative mode lets you spawn berry bushes and trees too, the placement was never quite accurate and typing the commands takes time. That was the biggest reason for me getting the Plant Everything mod. Build Restriction Tweaks was solely for the purpose of being able to build inside dungeon areas and because I indeed like to build
a lot, I also installed that NoStaminaCost. You can more or less customise all of these mods to match your likings.
Anyhoo, here are few new picks of my swamp house with a "basement"! I hid the entrance to the Sunkern Caverns with fireplaces and stairs so that it fits better with other decor. In the actual cavern I limited the space with wooden walls and added some shelves for making it more basementy.
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