Your layout looks great AS IS. I didn't do anything to mine, either, for a long time. I have been using tubular track for decades, and liked the toy train look. However, I have recently taken two steps beyond bare track: 1) I bought rubber ties to make the track ties/sleepers appear more properly spaced and realistic, and 2) I bought chicken grit to use as ground cover between tracks and along the ROW. It is not between the rails (so not true ballasting) and it is not spray glued down (and it hasn't been a problem with wheels or motors). Unconventional, but it works for me.
