There is nothing wrong with billboards and other large scale advertisements. Even if there is always a pedestrian or sinister element lurking somewhere.
However, they do tend to grasp your attention away from other worthy features of oururban surroundings, e.g: architecture, colour schemes, floor markings, vaulted areas, signs,lighting and the list goes on. The way these so-perceived passive elements are juxtaposed orcontrasted provide a subtler, cogent but ultimately more fulfilling pleasure than adverts which elicit immediate interpretation.
Switching to this preferable slowburn pleasure requires little discipline. Just tilting your head lightly up to the ceiling will open up a whole new universe that used to reside in our peripheral vision. Let the sidelines reclaim the limelight, it is only fair. The adverts will still be there but as footnote to something greater.