Totally agree. Colonia is boring. I was expecting a bigger town. A better visit would be Montevideo which is a real city.The only downside to the Colonia visa run is how boring it is no offense. OK there's the old town with some really old looking buildings and stone paved roads that make it easy to imagine you are in Ancient Rome for about 20 minutes, Then what do you do for the next 6 hours?
There is 1 street in town with restaurants serving awful quality food at USA level prices. You will inevitably end up eating something there out of pure boredom then hate yourself afterwards
The only joy comes from installing a step counter app on your phone and trying to break your records doing laps of the town