Naturalistic backgrounds, hands down lmao. Contrary to the OP, I am an architect (in-training* xD) so like utilizing perspecive points to render up city scenes is my jam! We don't even really do any drawing drawing for work, but I practiced it enough in school to be both okay and enjoy doing that.
But having to draw a tree, bush, or ESPECIALLY a rock or cliff? Eugh. I'm so bad at rendering those things nicely, and as a result it makes me loathe drawing them
Then it doesn't help that I like to draw stories about people going on cool fantasy adventures in nature... woops.