One of my superintendent friends looked at my pictures of courses in the UK, and when I asked him how we could blur the mowing lines like they did, he responded: "dull mower blades". Sure enough, in the UK some of the texture creeps out of the deep rough into the mowed areas because of just that ... bents and reeds that don't cut well with reel mowers.
Mr. Sims suggested another method: spilling some of the rough seed mixture into the mowed areas.
In America, though, for every one golfer who appreciates this there are five maintenance guys trying to spray out the weeds!