Geoffery:
My reference to Seascale was not on the course itself, or the land, but its setting, as Paul's original post wondered. I personally think houses can be a visual detriment to a course, although some very fine courses -- notably WF West and Merion East -- are situated on land where you can airmail a 5-iron into somebody's front lawn/bedroom window.
Would Brora/Dunaverty/Portnoo count since they double as cow pastures? Pennard too?
WF West doesn't have any homes that encroach upon the golf course. I don't recall any hole on the course where there is any risk of a stray golf ball. I believe the closest home sits well back behind the 3rd green. The only hole at Merion where the homes are anywhere close is the 7th hole/ 8th tee shot.
WF East has some homes pretty close--to the right of #1 fairway, right of #5 fairway (I've been in that guy's back yard), #14 to the left the fence for the house is right next to the greenside bunker.
On WF West, #10 its really pretty hard to even see the house behind the green and I don't think too many people air mail that green! I do think there is a house left of #15 green but overall WF is a beautiful setting.
East Lake in ATlanta is bad--not just the neighborhood which has improved 1000% but the noise from around the course--sirens, music, etc. can still be distracting.
Royal Liverpool isn't a great site--I think I remember seeing some type of industrial area or cranes from a port when I was on holes 8-10 but I can't be certain
Royal Porthcawl was near a public beach or resort kind of place. It wasn't so bad until I spotted a few Welsh ladies crossing the links to get to the beach--I am certain they were not representative of the rest of the ladies in Wales, but, DAMN, they needed some sun!!
Peidmont Driving Club in Atlanta is beautiful and I don't know if this counts, but it is located right near the busiest airport in the US--Hartsfield-Jackson and the constant noise from the planes is unbelievable--I guess you just get numb to it?!