OK, I know just what you are talking about. However, I have committed the same sort of self-indulgence (I have absolutely no contrition whatsoever for it, though) on a far larger scale than you.
First, there is the trolley in this neighborhood.... It has no business being there; even I know that much. Why? Because my experience with real-life trolleys has them servicing long distances among the numerous small towns around Pittsburgh, when I was a boy. None of them simply traveled zip-a-dee-do-dah around one little neighborhood.
Yet, I had no intention of having the track for a trolley reach farther into the layout because doing so would have, at one particular point, had six RR tracks parallel and the trolley rack running right up the middle of them, leaving no room for a roadway I wanted there. So, here is the li'l bugger making its very, very modest route around and within a modestly sized suburban neighborhood, as if it were "needed" to take pedestrians the distance any normal miniature person could easily have walked.
However, my maternal grandfather was a motorman, in McKeesport, PA, on just such a trolley as seen here,
and since I loved him greatly, there was no way he was not going to have his trolley on a layout built for play and sentimental self-indulgence, anyolways (!)
So, that's one of my sentimental self-indulgences in Moon Township, USA.
I've tried for realism, all along, but always kept myself reminded I was at-play, with the whole shebang.
Thanks for asking. To me, this was a good topic to post, Juanita Guy.
FrankM