More houses means more traffic in both directions, is what is actually obvious as they will have to travel beyond the immediate area for business and leisure activities like anywhere else. So there's no unlikely about it, especially considering the marginal properties of that variable and the fact that we are at the edge of the 'acceptable inefficiency' range as it is, if not beyond. Also it's not merely a Sunday driver type of problem as Sutton Crops is clogged many times during week days at off-peak times. The time to get through Sutton Cross was over 10 minutes each way on a not so sunny/no school Wed and Thurs mid-afternoon. This common now.
As for camper vans there are usually at least a dozen at any time; about 18 yesterday.
Paid parking is not a runner either as there is far too much resistance like when the overzealous parking warden was told to stop by the Gardaí a few years back.
Also the rough crowd phenomenon is thankfully a rarity despite some instances of bad trouble in recent times. Thankfully those instances could be counted on only one hand. Otherwise any trouble is no more or less than normal. Really do not know where you have picked up the notion that walking is anywhere as intimidating as you believe - unless you mean the gulls which are a pain because eejits feed them.