Right up there with comments like......
Runway behind you
Altitude above you
Fuel at the filling station.

See and avoid is still primary unless real IFR (IFR in VFR does NOT mean you don't look outside).

At our field, when we get to 5000', it pays to look to the north/northeast now and then. We are under an airway to the major airports in the NY metro area. We have tried to have ATC keep heavy iron above cloud base on weekends.

We are also about 18 miles from a VOR, so we look more when in that area.

But we should always be looking.
Black boxes and screens are nice to add to the mix, but I still rely on my eyeballs.