IMO it's primarily the oversized rail itself that creates the 'crowded' appearance. The center rail only compounds it. Several of us some years ago experimented with assembling a more visually pleasing 3 rail system for out layouts or display dioramas. I had a nice layout using MTH Scaletrax which to me was the best available commercially but the odd tie spacing gradually wore on me and I caved in and acquired Atlas 3 rail. The smaller MTH rail size looked very prototypical and the thin center 'blade' was non-intrusive in the manner that Lionel's Super O was.
Ron H. here came up with using Atlas 2 rail and attached N gauge rail to the base for the electrical pickup. The result was very good and as with ScaleTrax, the smaller rail gave our locomotives a more massive appearance.